Get VR/TrackIR camera pitch and yaw values

Greetings. I’m trying to simulate helmet-mounted display for my jetpack project (it’s like HUD but always in front of camera).

I have partial success - by using simvars CAMERA GAMEPLAY PITCH YAW:0 and CAMERA GAMEPLAY PITCH YAW:1 I am able to rotate dynamic texture quite smoothly, but with mouse movements (example attached). When I use head tracker or VR, this variable does not react on head pitch/yaw changes.

Is there any other variables that can capture VR camera direction? Or maybe alternative methods of rendering that can do same job - draw dynamic data on the screen in fixed position.