Any low power security cameras that would recommend with night vision and decent quality?
Ideally non-smart without a cloud option as I would like to connect it directly to an offline server with a cable or wifi (although not having a wifi might be better)
It's been a minute since I was researching this, but from what I remember, Reolink showed up the most for me.
If you can get your hands on older Ubiquiti camera's, G1 and G2 I believe, you can install their NVR software on any server.
Or you could always go the route of using a Raspberry Pi and basically making it from scratch, I know pishop has several camera modules and cases with different features, and if you were fine using WiFi, a Pi Zero would be enough to make it work.
One thing with Reolink, for anyone seeing this, just be sure to get one of the hardwired (for power) cameras. I have a wired Reolink doorbell (which is quite nice) and a solar+battery powered Argus which is practically useless other than as a deterrent. The battery powered devices don't integrate well, no video streams, and have very weak object detection.
If you'd like object detection with fully local processing/control, I'd highly recommend looking into Frigate. It uses a Coral TPU (basically a little USB stick that acts as an accelerator for detection) and works extremely well. It also has Home Assistant integration if you're using that. Frigate works with a wide range of cameras and all traffic stays on your local network.
They are discontinued, but you can still find them on ebay and whatnot.
I don't know about the g5 specifically, I'd assume that's just a fancy way of saying it's got good motion detection. AI gets thrown around to attract attention
I have a g3 camera and it doesn't require an internet connection after the initial setup if you create a local login for the NVR, but it does still require a Ubiquiti hardware NVR (the cloud key g2 and some of the routers also work), which could be a turn off for most people