Rendering single camera view with Cardboard SDK

Hi all,

I'm just wondering if there's a way of building a VR app that uses a single camera window rather than the default twin-window format with the Cardboard SDK?

Basically I want to be able to produce an app that let's users have the option of looking at VR either through a cardboard viewer or just via the phone screen as you do with many 360 vids on YT, FB etc.

Thanks in advance