Why HeadShake is not compatible with Cinema Verite, Track IR, FaceTrack etc?

At the moment, it seems that HeadShake must share the same datarefs with many other plugins. The same view dataref cannot be writed by more plugins at the same time.

We’re working to improve the compatibility but there isn’t a specific roadmap nor a release release date planned.

You may want to take a look at the X-Camera plugin that provides a compatibility interface for both HeadShake and the Track IR.