Movement of character in cardboard VR based on your head movement

Hello everyone!
I’m making an endless runner game and I’m targeting those people who have such VR devices which don’t have a controller. The game which I have made up until now allows me to move the character left and right using the “A” and “D” buttons. I want to make my endless character to move left and right using the head movement in VR just like in “Cubey Tube”. Can someone help me with this?
Thanks!

I have the same problem ,but i will make the movement via hands ,wish anyone helps us!