Need to implement a live-video "reality" for non-Argon browsers

[blairmacintyre]

Need a reality that puts video in the background (via getUserMedia) and perhaps does some tracking (via something like https://trackingjs.com).

Will need to create a method (and UI) for approximating the field of view of the camera. Whomever is doing this should talk to me, I have some ideas on this.