Thanks for posting, I was sure I recalled something like this form a long time ago. I also build my self a FreeTrack headset (https://en.wikipedia.org/wiki/FreeTrack) around this same time to play the Arma / Operating Flashpoint games using IR LED's attached to a hat that my webcam would track.
You're probably recalling OG Johnny Lee video: https://www.youtube.com/watch?v=Jd3-eiid-Uw
That's cool, what were the benefits/drawbacks of that compared to other VR headsets would you say?