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Better don't use C-style API anymore, it is more verbose, error-prone, no performance benefits and will be deprecated in the future(deprecate c api).

Here is the codes of c++ api, much easier and cleaner(we don't need goto again, because of the power of RAII, c++ programmers rarely need to use goto in their codes).

#include <iostream>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/tracking.hpp>

    int main()
    {
    cv::VideoCapture cap;
    cap.open(0);

    if( !cap.isOpened() )
    {
        std::cerr << "***Could not initialize capturing...***\n";
        std::cerr << "Current parameter's value: \n";
        return -1;
    }

    cv::Mat frame;
    while(1){
        cap >> frame;
        if(frame.empty()){
            std::cerr<<"frame is empty"<<std::endl;
            break;
        }

        cv::imshow("", frame);
        cv::waitKey(10);
    }

    return 1;
}

run on MacOSX 10.8.x