Render/Process on PC and display to tablet

Does anyone know how to do what they demonstrated on stage in this video (Unreal Engine Instantly Turns Andy Serkis Into An Alien - YouTube)?

They said that its all being computer and rendered on a PC and is being remote streamed onto the actual tablet, and that tech would be out with 4.20 (State of Unreal | GDC 2018 | Unreal Engine - YouTube).

I can’t seem to find anything about it and would really like to know how to do this. Does anyone have any suggestions on how I can get started with this?