What We Learned Porting Team Fortress 2 to Virtual Reality is a video of a 2013 GDC presentation from Valve on the topic. Here's word on what this is about from the good old days of VR:

This 2013 talk from Valve's Joe Ludwig describes lessons learned from Valve's experience porting Team Fortress 2 to virtual reality. Topics covered include an overview of what stereo support entails, rendering 2D user interface in a 90 degree field of view display, dealing with view models and other rendering shortcuts, and how mouselook can interact with head tracking in a first person shooter. In addition to the lessons that apply to Team Fortress 2, there are also several lessons that would apply to any new virtual reality game.

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