how do I add a rearview mirror to my VR auto simulation with out it taking over as the game camera?

I have a model of an automobile in VR. The XROrigin camera is the game camera, but I try to add a rearview mirror, it becomes the game camera.

Thank you wideeyenow_unity. I managed to find a link that was just what I was looking for. Unity3D mirror using camera and RenderTexture