Support capture SurfaceView on Android

[jhen0409]

Continues of #323.

• Use PixelCopy.request to capture SurfaceView content
• Update video example
  • Upgrade react-native-video to latest alpha version because v5.2 doesn't work (jcenter issue)
  • Set useTextureView={false} to use surface view (ref: https://github.com/react-native-video/react-native-video/blob/08c2220e1663808a7bac76babc404b51154a50af/android/src/main/java/com/brentvatne/exoplayer/ExoPlayerView.java#L107)
  • Keep the old video example, it used TextureView. So we can see two videos in example

[jhen0409]

@gre Please review this. Thanks!

[gre]

Thanks!