If the camera is connected to the same LAN as the NVR you should be able to add the camera to the NVR using the ONVIF or RTSP (usually port 554) protocols. You will need to know the IP address of the camera.
If the camera is connected to the same LAN as the NVR you should be able to add the camera to the NVR using the ONVIF or RTSP (usually port 554) protocols. You will need to know the IP address of the camera.