Sure, most any of them. I just added a camera on another Dahua NVR 30 miles away to my home NVR using the IP for the remote NVR and choosing a channel. Any network I can see I can snag a camera from a Dahua NVR I have the IP and credentials for,
Now I was able to do this because I remotely control the router serving that network the remote NVR is on (via OpenVPN), and I temporarily port forwarded it.
Not a good long term idea security wise,