We don’t have any community projects with the HoloLens, though it should work.
The THETA V appears as a standard webcam to a Windows 10 machine. Although I’m not familiar with HoloLens, I expect that it has an API to accept an equirectangular video stream. According to this article, Windows Mixed Reality immersive headsets should work with SteamVR. If that is the case, there are a number of projects on this site that use SteamVR and the THETA. Just use the THETA V as a standard webcam texture if you use Unity.
You will likely need this driver:
The last time I checked, audio is single channel only.
Most people are using tethered USB connection between the camera and the computer.
It’ll be great to hear your experiences with the HoloLens and THETA V.