Draw over a video on Android in real time

How to draw over a video on Android on pause and on recording ?

1. 1. Upload your video (MP4,  MKV or Webm format) 
   2. Choose a color 
   3. To start handwriting over the video Tap on  
   4. To change the brush size tap on
   5. Start to Record
   6. Slide your finger on mobile screen to draw in real time during the playing / recording of your video. If you use a low-end mobile make sure to move your finger slowly for a smooth drawing.
   7. To clear the drawing Tap on
   8. Pause
   9. Download your video