Recording and playback of user position/orientation would be good to have

[jackjansen]

If we could record user position, and camera position and orientation this would be very good to have for automating experiments, for example the messy latency experiments.

We could then do one session live where we also record the raw camera streams plus the camera trajectories for each user.

With these datasets we could repeat the exact same sequence automatically, but then with different protocols, codecs, settings, etc.

Related to #181

[jackjansen]

To remember: VRTApp-VQEG has a gaze recorder.

[jackjansen]

The most important right now is the MMSYS use case, but let's not forget that this functionality is more widely usable. For example to create trajectories for an automatic camera to record a session.