The Frigate docker image is generally nasty. It's humongous (5.5 GB), bundles and runs a ton of different things whether you use them or not, uses s6 as init and supervisor which is a piece of crap, and it cannot be secured – it won't run as a non-privileged user, it won't drop caps, you can't make it read-only because some genius configured nginx to put temporary files in with the app files, it conveniently includes apt so the attacker can install anything they might want inside the container, and in fact recommends running in privileged mode(!).
I think it's the most security-hostile docker image I have ever seen.