Yeah, I would recommend exploring https://github.com/digital-standard/ThreeDPoseTracker
and bvh tools (also linked in the git page)
There’s lots of other great free DIY mocap tools like freemocap https://github.com/freemocap/freemocap
If you’re trying to recreate the VR tool I created, I recommend using the meta body SDK and bvh tools.
The linked project CAREGIVR is open source and has a repo