Controlling Camera Rotation with the Mouse

For debugging purposes I would like to emulate the head rotation using the mouse.

Right now my script rely on the

 OVRRig.centerEyeAnchor.transform.localEulerAngles 

value, so to keep things accurate while testing I would like to influence that value using the mouse.

Is there an API for that (couldn't find anything)? If not what would be the best way to go about it?

Thanks!