With the disappearance of the kinect V2 and the uncertainty around the kinect V4 (for azure) , Nuitrack is the only available solution for skeleton (and face) tracking .
I made some quick test ( with D415 and D435) and it works pretty well. Tracking works even in portrait !
The company and team are very responsive and invested in supplying a good product.
Licensing is changing with new annual option ( not linked to a sensor)
Does anyone has played with it ? Any feedback ?