Then you need an Nvidia card. If you’re not using it for gaming and just inference, a lower-end RTX 30XX will get you what you want.

GPU will not improve performance for the surveillance software, just add inference. In fact, adding inference may even slow it down depending on what models it’s using (I’m assuming some variant of Yolo), and how deep you have object detection going. It’s also going to raise your power usage quite a bit, so I’d check the PSU in that machine and make sure that it can handle it. I think the RTX 3050’s can be powered by PCIE slot alone by this point, but you’d better double check whatever card youre considering to be certain. Also check if it even has space for the card.