This is how Left for Dead was meant to be played. I would love to see VR fully implemented into Left 4 Dead 3, if it ever gets released.
This was actually pretty easy to setup to.
I used a VR Box headset I have for Google Cardboard.
The game was running through Steam, and using another application called Trinus VR, I was able to send the gameplay to my phone, and control the mouse with my head tracking.
It's a great, cheap way to play some of your favorite games in VR. There will be some links provided, if you want to look into it yourself.
Google Cardboard: https://vr.google.com/cardboard
Tribus VR: http://trinusvr.com