Static IP addresses are much better for security cameras. You won’t have to recheck the camera’s IP address every now and then, and the IP address will stay with the camera forever. Whereas, DHCP, the protocol behind dynamic addressing, automates assigning addresses so it’s a bit easier if you don’t have to access the camera again and again. NVR and most modern routers are DHCP-enabled devices. It’s why most of the devices in your house don’t require additional changes to allow internet access. You already have a leased address and the router decides when to change it.