Tried to implement OpenPose (only single person) in Unity. But it lags too much. On my PC, it is running at 4/5 fps. But on Android, it is only 1 fps.
This project uses OpenCV for unity package. So, import it from asset store first. (It is NOT free :p) https://assetstore.unity.com/packages/tools/integration/opencv-for-unity-21088