doubt when developing a game with unity

I moved it.

If you were doing this in C++, it would be easy. The Oculus sdk initialisation function has a flag for invisible applications. That lets you make a VR app that has tracking and everything, but does no rendering and won't block other VR programs from running. I use it for my AutoOculusTouch project.

I don't know if that's accessible from unity though. I'm not a Unity developer.

If the invisible flag isn't available in Unity, perhaps a native dll that sets it up would work.

Actually, you could probably take the DLL from AutoOculusTouch and use it in Unity. It would need C# wrapper code, but on it's own it exposes Oculus Touch values. Right now there's no tracking though (that's on the way later), but it has the buttons, triggers and thumbsticks.