Don't get me wrong - I really dig your work, and I'm beyond happy someone in the VaM community is paving the way in terms of DIY-(body)tracking, but ... I really liked your PhoneController app, and I was hoping you'd further explore the possible improvements you mentioned when you published it? (IIRC, you pondered using some custom libraries (SENSORS_6DOF?) to help with drift correction).
For background: I'd wager many people in the community can manage to save up the dough for a Quest or similar at some point, but there's only very, very few peeps that can afford dedicated commercial fullbody-tracking solutions. Afaik, it's rare even amongst the semi-professional scene creators.
Granted, there's Driver4VR, which offers various DIY-solutions for lowerbody-tracking - but my impression is that they're more focussed on precise foot-tracking for action games & VRchat? (I haven't tried it yet, but I would wager that, say, a kinnect would have trouble correctly tracking at least one coordinate of the hip, since the sensors all face in one direction)
TL;DR - I think there'd be a lot of demand in the VaM community for a good, reasonably accurate DIY-hiptracking solution. Full lowerbody-tracking would be more awesome yet, but I think the hiptracking is going to be most critical, since so much of animation & posture is influenced by that atom/controller.
This plugin only manages camera: you turn your head to the left, VaM's camera turns to the left and image on your display runs to the right (so you see what was behind the left side of your monitor). You have to keep your eyes on the monitor. Eyes are not tracked, just head.
This is similar to what MS Flight Simulator's people use. Search youtube for "FaceTrackNOIR" -- there a lot of videos for this application of headtrackng.
For hiptracking :) , this seems to be easy task -- just slap an ArUco marker on your butt, and you good to go. Probably copying an example snippet from OpenCV docs would be enough for PoC.