title: How to make punch hole in Qt Application
body: <p>I need to make a punch hole in Qt application so that I can see the video running behind Qt graphics.
  My Qt application is using directfb api underneath.</p>
  
  <p>Is there any way to do this?</p>
  
  <p>Thanks,
  KBalar</p>
  
  <p><img src="https://i.stack.imgur.com/w6jy7.jpg" alt="enter image description here"></p>