I'm putting up some cameras on my property. It was harder than it should be to get a camera that doesn't send video straight to some cloud. Not impossible, but harder than it should be.
Discussion
I got a lot of those Wyze (Xaoumi) box cameras from Microcenter super super cheap open box. I loaded some custom firmware to them added dedicated access points and a private network, and used BlueIris at my last place. Worked great when it worked.
They are still super easy to hijack though. Since it's just a wild rtsp stream, proximity, some scripts and your neighbors can (pretty far ones if you live in the sticks) can spy on them. Had a buddy who was a real life hacker-man send me a picture of him watching the front of our house from his car parked in the next neighborhood just to prove a point XD
Yeah, I'm a ham and I work in wireless communications. My cameras will all be wired with no exceptions.