It's not an so unusual codec, this video has been enconded with AV1 codec, e.c. Youtube uses it for many 4K videos.but it's a unusual codec that will only play in a few video players...
You should have no problems playing it with VLC or many other video players (if your computer is not that old).
?? Topaz isn't a video player. Just re-encode it with Handbrake or any other program to the H.264 codec....eg. Topaz.