Link to the blender addon:
https://carlosedubarreto.gumroad.com/l/mocap_mpp2sos
Important info. on this version the addon dont have labelme.
if you need it to do yout manual calibration, you can get it here.
https://github.com/wkentaro/labelme/releases/download/v5.0.1/Labelme.exe
This version bundles with everything you need to create decente quality markerless mocap animation.
This is a workflow that came make your multicamera recording to be able to create complex body motions to use on animations.
If you have suggestions, bug or something else, you can get in contact with me here at patreon or https://twitter.com/carlosedubarret