[Gear VR] Modify/decenter the camera axis

Hi everybody !

I am working on a little game for Gear VR and one of the enemies throws knifes at the player. I would like to avoid the knifes by looking sideways with a sublte strafe effect on the camera. To achieve this I think the best way is to move the axis of the camera forward as shown in this gif made in 3d max.

Does anybody knows how to achieve this in Unity ?
Thx in advance !