Copy an cv::Mat inside a ROI of another one

Question

I need to copy a cv::Mat image (source) to an ROI of another (Destination) cv::Mat image.

I found this reference, but it seems that it does

Answer 1

Did work for me this way:

Mat imgPanel(100, 250, CV_8UC1, Scalar(0));
Mat imgPanelRoi(imgPanel, Rect(0, 0, imgSrc.cols, imgSrc.rows));
imgSrc.copyTo(imgPanelRoi);

imshow("imgPanel", imgPanel);
waitKey();

I am using Opencv 2.4.9 Based on Andrey's answer.