On the camera you have to Activate the Onvif Protocol:
Onvif protocol is activated and in "Reset password" the password to be used to add it to NVR is configured
It can be added to Safire, Uniview and X-Security NVR with Onvif protocol, port 8000 and admin user together with the password configured before.
SAFIRE
UNIVIEW
X-SECURITY
The camera has only one simultaneous user, so its addition is limited to a single NVR