Looks like Unity's solution just a bit more refined.
Preview: 'John Wick: The Impossible Task' Puts You in the Shoes of an Elite Assassin - Road to VR
I'll Get to play as john Wick, This is just too awesome.
Both will be amazing tools for tweaking things during game testing. "No, that doesn't look quite right." Pause game and make change still in headset. "Perfect!"