Demo http://vatelier.net/MyDemo/AframeDiscovery/
Honestly it works but I just don't really what good can come out of this. It's all about 3D and experiences. Yes... surely videos can be used in a fun but the point of VR is to escape the flat screen.
Consider for integration https://www.npmjs.com/package/aframe-chromakey-material
Exercise : prove me wrong. I'm serious.
Done? Go back to learn more.