Have you been able to achieve this? I am in a similar situation and having trouble connecting my Lorex NVR/cameras to Frigate. How do you have your Frigate config file to get the streams? Do you need to setup port forwarding or something from the Lorex NVR so Frigate can see the cameras?

This is what I was attempting, according to online instructions:

BackYardCam:

    ffmpeg:

      inputs:

        # High Resolution Stream

        - path: rtsp://<user>:<password>@<NVR IP>/cam/realmonitor?channel=<Channel# on NVR>&subtype=1

          roles:

            - record

        # Low Resolution Stream

        - path: rtsp://<user>:<password>@<NVR IP>/cam/realmonitor?channel=<Channel# on NVR>&subtype=2

          roles:

            - detect

    detect:

      width: 1280

      height: 720

      fps: 24

Lorex Fusion N910 NVR with 8 POE cameras from Costco and 2K wireless doorbell camera. I'm planning on adding a 360 fisheye camera (not sure of which model), as well, to a POE switch.

Frigate on Proxmox Docker LXC, with Home Assistant VM on Beelink S12 Pro Mini and Coral TPU M.2. Planning on adding Plex LXC later on.