Get CCTV Video Stream URL of DVR/NVR/XVR
Your DVR will stream with RTSP Protocol (port 554)
So you need IP Address, User, Password and Channel No. to composite the streaming url
For example,
rtsp://192.168.1.207:554/user=admin&password=1234&channel=2&stream=0.sdp?real_stream--rtp-caching=100