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cv::VideoCapture cap;
if (!cap.isOpened())  // check if succeeded to connect to the camera
   CV_Assert("Cam open failed");
failed");
  
cap.set(CV_CAP_PROP_FRAME_WIDTH,640);
cap.set(CV_CAP_PROP_FRAME_HEIGHT,480);cap.set(CV_CAP_PROP_FRAME_HEIGHT,480);

http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html#videocapture-set