void draw_rectangle(uint8_t *frame, int x, int y,
                    int width, int height)
{
    cv::Mat frame_yuv;
    int size[2];
    Point pt1, pt2;
    cv::Scalar color = Scalar(255, 0, 0);

    size[0] = width + width/2;
    size[1] = height;
    frame_yuv = cv::Mat(2, size, CV_8UC1, frame);

    pt1.x = x;
    pt1.y = y;
    pt2.x = x + width;
    pt2.y = y + height;

    rectangle(frame_yuv, pt1, pt2, Scalar(0, 0, 255));
}