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My solution was a little bit different:

// CameraFeed02e.cpp : Defines the entry point for the console application.
//
#include <opencv2/opencv.hpp>
using namespace cv;

int main()
{
    // Initialize and allocate memory to load the video stream from camera
    VideoCapture camera(0);

    if (!camera.isOpened())
        return 1;

    while (true)
    {
        // Grab and retrieve each frames of the video sequentially
        Mat frame;
        camera >> frame;
        //imshow("VideoOriginal", frame); //just for debug purpose

        // Set Region of Interest to the area defined by the box
        cv::Rect roi;
        roi.x = 0;
        roi.y = 0;
        roi.width = 320;
        roi.height = 480;

        // Crop the original image to the defined ROI
        cv::Mat crop = frame(roi);
        cv::imshow("crop", crop);

        //wait for 40 milliseconds
        int c = cvWaitKey(40);

        //exit the loop if user press "Esc" key  (ASCII value of "Esc" is 27)
        if (27 == char(c))
            break;
    }

    return 0;
}