I set up, many years ago, a RPI1 with USB cameras attached. Running the software “Motion”. I put Zerotier on it and made a little web page that shows the cameras. I could have the page show any USB cameras on my network, but I think the RPI1 is too low powered for more than two.

Motion will record, or only record when motion is detected and there’s a whole lot of options.

Mine is still running almost ten years later, with only a small upgrade to the cameras.

I use Zerotier. I have a rpi sharing my Linux isos through a commercial VPN. The RPI has Zerotier as well as my other devices, so I can connect to it from anywhere as if it was on my home network.