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you should probably stop trying with any outdated opencv1.0 c - based ideas, but use opencv2 style c++:

#include "opencv2/opencv.hpp"
using namespace cv;

#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
    Mat frame;
    VideoCapture cap;
    if (argc>1) cap.open(argv[1]);
    else cap.open(0);
    while(cap.isOpened() && cap.read(frame))
    {
        //
        // process frame as you wish..
        //
        imshow("ocv",frame);
        if (waitKey(10)==27) break;
    }
}

you should probably stop trying with any outdated opencv1.0 c - based ideas, but use opencv2 style c++:

#include "opencv2/opencv.hpp"
using namespace cv;

#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
    Mat frame;
    VideoCapture cap;
    if (argc>1) cap.open(argv[1]);
    else cap.open(0);
    while(cap.isOpened() && cap.read(frame))
    {
        //
        // process frame as you wish..
        //
        imshow("ocv",frame);
        if (waitKey(10)==27) break;
    }
}

you should probably stop trying with any outdated opencv1.0 c - based ideas, but use opencv2 style c++:

#include "opencv2/opencv.hpp"
using namespace cv;

int main(int argc, char **argv)
{
    Mat frame;
    VideoCapture cap;
    if (argc>1) cap.open(argv[1]);
cap.open(argv[1]); // some vid passed as cmdline arg
    else cap.open(0);
cap.open(0);              // by default use webcam
    while(cap.isOpened() && cap.read(frame))
    {
        //
        // process frame as you wish..
        //
        imshow("ocv",frame);
        if (waitKey(10)==27) break;
    }
}