In-Game Screen Recording Feature for PojavLauncher

I'm looking for an experienced developer to enhance the PojavLauncher (an open source Android project) with an in-game screen recording feature. The recording should be focused solely on the game, excluding the rest of the screen.

Key Features:
- A dedicated button in the sidebar to start/stop recording.
- Videos to be saved in MP4 format to the gallery.
- No visual indicators for the recording status within the game.
- Only game audio to be captured along with the video.

Ideal Skills:
- Proficient in Android development.
- Experience with open source projects.
- Strong understanding of video recording integration.
- Good knowledge of Java and/or Kotlin.
- Knows OpenGL (for game rendering).
- Prior work with PojavLauncher would be a significant advantage.

Please note, there's no need for visual indicators to show when recording is taking place, and the video should only capture the game audio, not any microphone input.