There is interest to continue your fun with algorithms of image analysis. Prior to that, worked with one camera connected to the PC via Firewire. Accordingly could write programs on both Windows and Linux.
Maybe someone knows whether it is relatively easy to install your software on already existing stand-alone DVRs? By "relatively simple" I mean a documented process: toolchain, programming guide, ssh access.
And if you use a PC with video capture card?
Or my only option is to use a digital camera in conjunction with a PC and fully write all the software? I would like to integrate with ready-made solutions, because they allow you to view videos through the network, to archive, display images from multiple cameras. I would not like to reinvent the wheel and write everything by yourself.