They had a very very similar thing in bicentennial man

Many selfhosted NVRs have been suggested. Personally ive tried:

iSpy

Frigate

Zoneminder

Shinobi

Ended up settling on zoneminder at this stage.

For cameras themselves i just want to point out the OpenIPC project - opensource firmware if youre technically inclined

Edit: I’m hesitant to recomment OpenIPC now since the main streamer is closed source. Thingino is fully open and developed by some of the devs who didn’t agree with the closed source portion