This topic has come up before, and the consensus seems to be something along these lines:
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VR rig needs direct control of the camera, so you can’t let CM directly control the camera or they will fight.
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You can set up CM to control the location of parent of the VR rig, allowing VR to position the camera in relation to that. Do it like this:
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Remove the CM Brain component from the Camera, if one is there
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Manually add a CM Brain to the parent of the VR rig. Then, any vcams in your scene will drive the transform of that parent object instead of the camera. Blends etc will all function normally, but CM will not be able to control the camera lens (which for VR is the right thing)
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Be very cautious with vcam movement, or you may expose your victim to motion sickness