VR Camera rig outside the head

Hello i am using Oculus and a Mixamo model for avatar. I made the VR
Setup as the video tutorial. But when i am standing up and i am looking
down i actually looking outside my head (in the back of my head) The
OVRCamera rig goes outside the avatar. In fact i can go as higher i can
get . Is there any way to constraint camera rig INSIDE my head? (and in
front of my eyes?)