[otterpro]

Like mentioned before, get any IP camera and make sure it has ONVIF. On software side, ZoneMinder is a popular OSS NVR/DVR for Linux. That way, all the recording remains on my self-hosted solution or on my home server and not to a 3rd party cloud service. I bought my cheap security camera from Amazon with ONVIF and they've been better than expected.

[zeroping]

Frigate https://frigate.video/ is a strong up and coming NVR that does object detection. Many people are using it with relatively inexpensive Amcrest, Dahua, or other RTSP cameras, and then isolating those cameras so they can only send traffic to the NVR.