How to set custom position and orientation to Oculus SDK in Unity project for GearVR?

Hi,
I have my own tracking system: positional tracking + orientation. And I have to use them both. I have not found a way to set custom orientation to OVR camera in Unity3D engine! Any attempt to rewrite camera orientation in scripts leads to wobbling or incorrect rendering. Is there any way to completly ignore GearVR gyroscope tracking and use custom?