Is it possible to apply the PostProcess over the VR and XR camera too?
Playground: Babylon.js Playground
The best person to ask would be @RaananW 
Some post processes can be enabled, yes. If it is not based on a layer that is projected on top of the scene.
It can be added like this:
PostProcess VR | Babylon.js Playground (babylonjs-playground.com). You need to add the xr rig cameras to the list of cameras the post process will run on. The cameras are available on the first XR frame, so - addOnce on the XRFrame observable and you are good to go
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