This is one of the longer journeys that I have gone through to figure something out. It took me about three years of on and off research in a language and a tech community I knew very little of. I was working on a project in Tokyo in 2012 and saw Qumarion for the first time at a computer store in Ikebukuro. It was a love of first sight because I was looking for alternative tools and pipelines for 3D modeling, rigging, and animation.
Qumarion in action within Unity 3D 
My son took a shot at it. 
by Aiden Li 
chilling 
shy
Helpful tools:
Scene Motion Capture:
https://assetstore.unity.com/packages/tools/animation/scene-motion-capture-19622
https://forum.unity.com/threads/record-playmode-animations-for-model.659917/
Unity’s Animation Rigging plug-in is capable of recording animation at runtime!
“12:20 …and if I keep that change it will be saved to the clip so during gameplay animators can create new animations…”
And in this STYLY tutorial:
How to record a character’s motion with EVMC4U and EasyMotionRecorder
https://styly.cc/tips/evmc4u_easymotionrecorder_virtualmotioncapture/
in which this jewel was mentioned:
EasyMotionRecorder:
https://github.com/neon-izm/EasyMotionRecorder