According to project tango tutorial
Once you're set up, try making a simple VR application on Project Tango using our Unity prefab motion tracking tutorial. Also check out our Unity code samples on GitHub for more inspiration!
https://developers.google.com/project-tango/apis/unity/
but the prefab motion tracking tutorial don't have any VR instruction
https://developers.google.com/project-tango/apis/unity/unity-prefab-motion-tracking
Anyone know how to make the delta camera camera to VR mode?
Found it under tango VR examples