while (true)
{
    frame = cvQueryFrame(capture);
    cvShowImage("My window", frame);
    if (cvWaitKey(33) == 27)
    { // ESC
        break;
    }
}

VI.setIdealFramerate(dev1, 25); //the framerate change didn't solve the problem
VI.setupDevice(dev1, 720, 576, 0);

image_VI = cvCreateImage(cvSize(VI.getWidth(dev1), VI.getHeight(dev1)), IPL_DEPTH_8U, 3);

while (true){

    VI.getPixels(dev1, (unsigned char *)image_VI->imageDataOrigin, false, true);
    cvShowImage("My window", image_VI);

    if (cvWaitKey(33) == 27) {
        // ESC
        break;
    }
}