I think he means self-hosted on your own hardware, rather than requiring their Unifi Protect appliances. You used to be able to with their old Unifi Video .

Unofficially (and therefore not supported), you can just take their binaries and run it on your own hardware. But since they only support their own hardware and it's arm64 hardware, you only get arm64 binaries: https://github.com/dciancu/unifi-protect-unvr-docker-arm64

With them adding generic onvif camera support, I might try it again because the other options aren't amazing either.