Write changes to the camera will probably not work. You find the URL in the onvif manager here
In NCS add the camera using Custom URL.
-set stream type to rtsp_tcp
-address should have the format rtsp://username:password@IPnumber/what is after the / in onvif manager..
In my case I use rtsp://username:firstname.lastname@example.org:554/1
Most likely port number 554 is not necessary to use.