Go to "Integrations" → "AgentDVR"
Add URL, no #
Best option I found was to have camera on it's own lovelace view w/ "panel" mode and then the alarm panel on another screen. This allows using "browser_mod" to work best by opening that URL. I haven't figured out how to automate opening fullscreen, but it's better then ZoneMinder in a way because the stream in HA is live always.