VR noob quick question

Hi all!

I am interested to make add a VR option to my mobile app (is a non-game app, a simple 3D file viewer).

I am working with unity3D 5.3.x:

1) Is possible to build a Mobile App that can runtime switch from normal to VR render?

2) Is possible to make an Android app that support both cardboard and gearVR?

Any feedback is very appreciated!
Kenshin