If the current setup can't, plugging the cameras and the NVR into a separate switch and none of that traffic will go near the rest of your LAN.
Wifi on the other hand, there's really no (practical) segregation to speak of - the spectrum has limited bandwidth, it doesn't matter if it's a different SSID / wifi network, it'll affect your Wifi!
I don't get why people don't get that part. What they mean by "Up to 1234 Mbps" on the box is "1234 Mbps shared". It's a giant wire occupying 1/4 mile around the AP, whereas, in wired Ethernet it's 1Gbps per link per direction.
A GbE switch with wire-rate transfer guarantee can handle 1Gbps traffic between arbitrary combination of ports. All the camera traffic coming from port 9 to 16 going to NVR on port 7 have no impact to traffic between upstream router on port 26 and your PCs on port 3 and 5. That cannot happen with Wi-Fi because everything is inherently on the same shared port 1(sometimes literally); each 4Mbps incoming is 4Mbps of download speed taken from your laptop. Double if destination is also on Wi-Fi.
This might be fine if there's just few cameras, but it's something to be aware of.
If you live in a sufficiently low density area (rural or suburban with large lots) you can put the two networks on different channels and they won’t meaningfully interfere with each order.
The chances are, if you live somewhere like that, somewhere that actually has a low noise floor for RF, then you likely also have a lot of space to cover with your wifi - and that means sacrificing range (via additional access points) for the second network..
For me: Wifi is great! But, whenever it's practical, I avoid it... Everything with it is a tradeoff!
If the current setup can't, plugging the cameras and the NVR into a separate switch and none of that traffic will go near the rest of your LAN.
Wifi on the other hand, there's really no (practical) segregation to speak of - the spectrum has limited bandwidth, it doesn't matter if it's a different SSID / wifi network, it'll affect your Wifi!