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Something like this will get you two images and save them to two matrixes then you can always pass them to functions from inside the loop for processing.

  VideoCapture stream(1);
  if(!stream.isOpened()){
    cout << "Video stream unable to be opened exiting.." << endl;
    exit(0);
  } 

  Mat img1, img2;

  namedWindow("curImg", CV_WINDOW_AUTOSIZE);

  int w_width = 200;
  int w_height = 75;
  int counter=0;
  int delay = 100; // delay in milliseconds

while(true){
    cap >> img;
    Mat frame = Mat(w_height, w_width, CV_8UC3, Scalar(255,255,255));

    if(counter%2 ==0){
      frame.coppyTo(img1);
    }else{
      frame.copyTo(img2);
    }

    imshow("curImg", frame);
    waitKey(delay);
    counter++;
 }