It works pretty well most of the times, but sometimes it crashes when the object's region of interest (ROI) falls out of the valid frame region, i.e., the rectangle between (0,0) and (frame.size().width-1, frame.size().height-1).
I couldn't find any documentation stating the termination rule of the cv::Tracker. I wonder if anyone knows what is an acceptable ROI and what is not!e ROI and what is not!