title: Android - Displaying ExoPlayer in a circle
body: <p>I am trying to display a ExoPlayerView inside a circle, overlaying another ExoPlayer (picture in picture):
  <a href="https://i.stack.imgur.com/VReis.png" rel="noreferrer"><img src="https://i.stack.imgur.com/VReis.png" alt="enter image description here"></a></p>
  
  <p>I have tried putting the 2nd player inside a frame with rounded corners (both <a href="https://stackoverflow.com/questions/16161448/how-to-make-layout-with-rounded-corners">this answer</a> and <a href="https://stackoverflow.com/questions/26074784/how-to-make-a-view-in-android-with-rounded-corners">this one</a>) but the player will always escape the parent frame and draw the video's full rectangle.</p>
  
  <p>I found <a href="https://medium.com/@fabrantes/rounded-video-corners-on-android-part-i-68eca391f39b" rel="noreferrer">this solution</a> which uses a GLSurfaceView, however this solution uses the classic MediaPlayer and not ExoPlayer.</p>