Can I use hmd without capturing display from UE4?

I’m developing two applications that use body tracking. One is in UE4 and the other is not. As UE4 has its own IK solvers, I created blueprints that do this work.

To introduce the hmd and the controllers, I create a camera and motion controller objects respectively. The camera shows me what is happening on the level (duh!) and this is desired when I am on the UE4 application.

For the other one, the HMD display is provided by that application and I’m using UE4 for the IK work since it is easier to get tracker info from unreal. As far as unreal is concerned, the hmd should be treated like another tracker.

Is it possible for me to prevent the the camera actor from feeding display to my hmd? Is such a set-up possible?