在Qt Widget中的视频上绘画

I am developing a Qt application that can play the videos and shows some scrolling bar along the way. The window size MUST Not exceed the limit of 720px in height and 1280 in width. I use MPlayer as a slave process and pass it the winId() of the QWidget and it renders the video in it. Now I want another widget on top of this video widget to show some results all the time but placing a label widget on top of the widget that contains video does not serve the purpose as it gets painted over and over by the video. Any workaround? Suggestions about it?I am developing a Qt application that can play