Haven is pretty neat in that it can be sound or motion activated.

I’ve used it in the past and it is definitely simple and comes from the guardian project (they used to be the tor repo folk)

However, it hasn’t seen an update in 4 years, so, it may have some issues(?) with newer os.

Haven: Keep Watch (Protect personal spaces and possessions without compromising privacy) https://f-droid.org/packages/org.havenapp.main/

I already tried, doesnt work.

If something moves in the fov of the camera, the app seems to indicate that its recording, but then it kinda just freeze… idk what its doing, but I never found any video files anywhere… 🤷‍♂️