Remember HoloBike from Saga, a new indie project which recently launched a Kickstarter, raising 4x its target goal? It basically integrates a virtual world with an exercise bike -- without needing a VR headset.
Courtesy founder/lead engineer Samuel Matson (who last worked in Google's VR division), here's some video which shows how Saga intends to create that virtual world. What you're looking at above was actually first captured by a drone in the real world, with an algorithmic process which converted it into this virtual scene: