This seems to a very closed solution. I chatted with Zmodo and got the result below from the. Usualkl, the give all that info away with no problems.
These cams seems to be something new for them so they might have changed tactics and use a propitiatory solution.
Have you tested onvif?
This URL is very common for their other cams so test this one also in Custom URL. Set stream type to rtsp_tcp and address
Can you login to the camera? Sometimes you can find info there.