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You can't used format and int in cv2.rectangle and cv2.circle. Format is for merely print or cv2.putText. Noticed., I fot an error stating that TypeError: integer argument expected, got float. So I added slash. Here is code:

import cv2

# Load the cascade
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

# To capture video from webcam. 
cap = cv2.VideoCapture(0)
# To use a video file as input 
# cap = cv2.VideoCapture('filename.mp4')
#Text Stuff
rectangleThicknes = 1
videoCenterCircleColor = (0, 255, 0)
videoCenterCircleThickness = 1
rectangleCenterCircleColour = (255, 0, 0)
rectangleCenterCircleThickness = 1

while True:
    # Read the frame
    _, img = cap.read()
    #Draw a circle in the middle of the video
    circle = cv2.circle(img, (320, 210), 5, videoCenterCircleColor, videoCenterCircleThickness)
    # Convert to grayscale
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    # Detect the faces
    faces = face_cascade.detectMultiScale(gray, 1.1, 4)
    # Draw the rectangle around each face
    for (x, y, w, h) in faces:
        ###Start finding "x, y, w, h"###
        rectangleXposition = (x)
        rectangleYposition = (y)
        rectangleWidth = (w)
        rectangleHeight = (h)
        rectangleHalfWidth = int(rectangleWidth) / 2
        rectangleHalfHeight = int(rectangleHeight) / 2
        rectangleCenterXaxis = int(rectangleXposition + rectangleHalfWidth)
        rectangleCenterYaxis = int(rectangleYposition + rectangleHalfHeight)
        ###End finding "x, y, w, h"###

        #Draw a circle in the center of the rectangle around the face
        circle = cv2.circle(img, (rectangleCenterXaxis, rectangleCenterYaxis), 5, rectangleCenterCircleColour, rectangleCenterCircleThickness)
        cv2.rectangle(img, (x, y), (x+w, y+h), (255, 0, 0), rectangleThicknes)
    # Display
    cv2.imshow('img', img)
    # Stop if escape key is pressed
    k = cv2.waitKey(30) 
    if k is 27:
        break
# Release the VideoCapture object
cap.release()
cv2.destroyAllWindows()

import cv2

# Load the cascade
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

# To capture video from webcam. 
cap = cv2.VideoCapture(0)
# To use a video file as input 
# cap = cv2.VideoCapture('filename.mp4')
#Text Stuff
rectangleThicknes = 1
videoCenterCircleColor = (0, 255, 0)
videoCenterCircleThickness = 1
rectangleCenterCircleColour = (255, 0, 0)
rectangleCenterCircleThickness = 1

while True:
    # Read the frame
    _, img = cap.read()
    #Draw a circle in the middle of the video
    circle = cv2.circle(img, (320, 210), 5, videoCenterCircleColor, videoCenterCircleThickness)
    # Convert to grayscale
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    # Detect the faces
    faces = face_cascade.detectMultiScale(gray, 1.1, 4)
    # Draw the rectangle around each face
    for (x, y, w, h) in faces:
        ###Start finding "x, y, w, h"###
        rectangleXposition = (x)
        rectangleYposition = (y)
        rectangleWidth = (w)
        rectangleHeight = (h)
        rectangleHalfWidth = int(rectangleWidth) / // 2
        rectangleHalfHeight = int(rectangleHeight) / // 2
        rectangleCenterXaxis = int(rectangleXposition + rectangleHalfWidth)
        rectangleCenterYaxis = int(rectangleYposition + rectangleHalfHeight)
        ###End finding "x, y, w, h"###

        #Draw a circle in the center of the rectangle around the face
        circle = cv2.circle(img, (rectangleCenterXaxis, rectangleCenterYaxis), 5, rectangleCenterCircleColour, rectangleCenterCircleThickness)
        cv2.rectangle(img, (x, y), (x+w, y+h), (255, 0, 0), rectangleThicknes)
    # Display
    cv2.imshow('img', img)
    # Stop if escape key is pressed
    k = cv2.waitKey(30) 
    if k is 27:
        break
# Release the VideoCapture object
cap.release()
cv2.destroyAllWindows()

You can't used format and int in cv2.rectangle and cv2.circle. Format is for merely print or cv2.putText. ~~Noticed.,~~ Noticed, I ~~fot~~ got an error stating that TypeError: integer argument expected, got float. So I added slash. Here is code:

import cv2

# Load the cascade
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

# To capture video from webcam. 
cap = cv2.VideoCapture(0)
# To use a video file as input 
# cap = cv2.VideoCapture('filename.mp4')
#Text Stuff
rectangleThicknes = 1
videoCenterCircleColor = (0, 255, 0)
videoCenterCircleThickness = 1
rectangleCenterCircleColour = (255, 0, 0)
rectangleCenterCircleThickness = 1

while True:
    # Read the frame
    _, img = cap.read()
    #Draw a circle in the middle of the video
    circle = cv2.circle(img, (320, 210), 5, videoCenterCircleColor, videoCenterCircleThickness)
    # Convert to grayscale
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    # Detect the faces
    faces = face_cascade.detectMultiScale(gray, 1.1, 4)
    # Draw the rectangle around each face
    for (x, y, w, h) in faces:
        ###Start finding "x, y, w, h"###
        rectangleXposition = (x)
        rectangleYposition = (y)
        rectangleWidth = (w)
        rectangleHeight = (h)
        rectangleHalfWidth = int(rectangleWidth) // 2
        rectangleHalfHeight = int(rectangleHeight) // 2
        rectangleCenterXaxis = int(rectangleXposition + rectangleHalfWidth)
        rectangleCenterYaxis = int(rectangleYposition + rectangleHalfHeight)
        ###End finding "x, y, w, h"###

        #Draw a circle in the center of the rectangle around the face
        circle = cv2.circle(img, (rectangleCenterXaxis, rectangleCenterYaxis), 5, rectangleCenterCircleColour, rectangleCenterCircleThickness)
        cv2.rectangle(img, (x, y), (x+w, y+h), (255, 0, 0), rectangleThicknes)
    # Display
    cv2.imshow('img', img)
    # Stop if escape key is pressed
    k = cv2.waitKey(30) 
    if k is 27:
        break
# Release the VideoCapture object
cap.release()
cv2.destroyAllWindows()

You can't used ~~format and int~~ format in cv2.rectangle and cv2.circle. Format is for merely print or cv2.putText. Noticed, I got an error stating that TypeError: integer argument expected, got float. So I added slash. Here is code:

import cv2

# Load the cascade
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

# To capture video from webcam. 
cap = cv2.VideoCapture(0)
# To use a video file as input 
# cap = cv2.VideoCapture('filename.mp4')
#Text Stuff
rectangleThicknes = 1
videoCenterCircleColor = (0, 255, 0)
videoCenterCircleThickness = 1
rectangleCenterCircleColour = (255, 0, 0)
rectangleCenterCircleThickness = 1

while True:
    # Read the frame
    _, img = cap.read()
    #Draw a circle in the middle of the video
    circle = cv2.circle(img, (320, 210), 5, videoCenterCircleColor, videoCenterCircleThickness)
    # Convert to grayscale
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    # Detect the faces
    faces = face_cascade.detectMultiScale(gray, 1.1, 4)
    # Draw the rectangle around each face
    for (x, y, w, h) in faces:
        ###Start finding "x, y, w, h"###
        rectangleXposition = (x)
        rectangleYposition = (y)
        rectangleWidth = (w)
        rectangleHeight = (h)
        rectangleHalfWidth = int(rectangleWidth) // 2
        rectangleHalfHeight = int(rectangleHeight) // 2
        rectangleCenterXaxis = int(rectangleXposition + rectangleHalfWidth)
        rectangleCenterYaxis = int(rectangleYposition + rectangleHalfHeight)
        ###End finding "x, y, w, h"###

        #Draw a circle in the center of the rectangle around the face
        circle = cv2.circle(img, (rectangleCenterXaxis, rectangleCenterYaxis), 5, rectangleCenterCircleColour, rectangleCenterCircleThickness)
        cv2.rectangle(img, (x, y), (x+w, y+h), (255, 0, 0), rectangleThicknes)
    # Display
    cv2.imshow('img', img)
    # Stop if escape key is pressed
    k = cv2.waitKey(30) 
    if k is 27:
        break
# Release the VideoCapture object
cap.release()
cv2.destroyAllWindows()

You can't used ~~format~~format in cv2.rectangle and cv2.circle. Format is for merely print or cv2.putText. Noticed, I got an error stating that TypeError: integer argument expected, got float. So I added slash. Here is code:

 import cv2

# Load the cascade
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

# To capture video from webcam. 
cap = cv2.VideoCapture(0)
# To use a video file as input 
# cap = cv2.VideoCapture('filename.mp4')
#Text Stuff
rectangleThicknes = 1
videoCenterCircleColor = (0, 255, 0)
videoCenterCircleThickness = 1
rectangleCenterCircleColour = (255, 0, 0)
rectangleCenterCircleThickness = 1

while True:
    # Read the frame
    _, img = cap.read()
    #Draw a circle in the middle of the video
    circle = cv2.circle(img, (320, 210), 5, videoCenterCircleColor, videoCenterCircleThickness)
    # Convert to grayscale
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    # Detect the faces
    faces = face_cascade.detectMultiScale(gray, 1.1, 4)
    # Draw the rectangle around each face
    for (x, y, w, h) in faces:
        ###Start finding "x, y, w, h"###
        rectangleXposition = (x)
        rectangleYposition = (y)
        rectangleWidth = (w)
        rectangleHeight = (h)
        rectangleHalfWidth = int(rectangleWidth) // 2
        rectangleHalfHeight = int(rectangleHeight) // 2
        rectangleCenterXaxis = int(rectangleXposition + rectangleHalfWidth)
        rectangleCenterYaxis = int(rectangleYposition + rectangleHalfHeight)
        ###End finding "x, y, w, h"###

        #Draw a circle in the center of the rectangle around the face
        circle = cv2.circle(img, (rectangleCenterXaxis, rectangleCenterYaxis), 5, rectangleCenterCircleColour, rectangleCenterCircleThickness)
        cv2.rectangle(img, (x, y), (x+w, y+h), (255, 0, 0), rectangleThicknes)
    # Display
    cv2.imshow('img', img)
    # Stop if escape key is pressed
    k = cv2.waitKey(30) 
    if k is 27:
        break
# Release the VideoCapture object
cap.release()
cv2.destroyAllWindows()