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Create a hue transform video of an RGB video

I want to create a video that's the hue transformation and then convert it to a binary image using thresholding. I give an RGB video as input and want to write it's hue transformation. Can someone help me? This is the code I have written (process_img does the transformation).

cap = cv2.VideoCapture(file_path)
fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
out = cv2.VideoWriter(vid_out,fourcc, 30, (640,480))

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
        result = process_img(frame)

        # write the flipped frame
        out.write(result)
        # frame = np.ndarray(frame)
        cv2.imshow('frame',result)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()

It works fine when it outputs the image in cv2.imshow() but the video is working. Can someone help me with this?