There’s already a proposal for a generic Virtual and Augmented Reality site. A specific device like the Oculus Rift or the HTC Vive would seem to be on topic there and could get its own tag if a more generic
hardware doesn’t do.
Some questions that would be on topic on a dedicated site for a specific head-mounted display (HMD) may be (also) on topic on other existing or proposed sites, e.g. CAD, 3D Graphics, Computer Graphics, Hardware / Software recommendations, Game Dev, Gaming.