[Feature] Add support of v4l2 and rkmpp hardware decoders

Feature Request

Summary

Add support of hardware decoders for ARMs.

  • Raspberry Pi has support (on both arm and arm64 arch) of V4L2 M2M decoders/encoders.
  • Rockchip-based boards can utilize MPP hardware decoders

Prerequisites

Have FFMPEG with mentioned decoders enabled

Proposed Implementation

References

This docker image has mentioned commits integrated as well as ffmpeg with necessary codecs. Tested h264 codecs on RPi4 and Rock64 boards.