How to reflect camera view to oculus HMD while running other apps?

Hi, Im a Japanese student and please excuse my poor English.

I want to reflect camera view to Oculus HMD while running other apps using Oculus Rift and Touch, according to the title.
If I run Unity Editor while other app running, the view of camera in Unity reflect to HMD, but the control of other app (using Oculus Rift)will stop.
I think this is maybe because Unity uses head and hand tracking, but I dont use them in my Unity project. I just want to reflect camera view of Unity(In addition, this camera is disabled head tracking)to HMD.

Are there any good methods for this?