I have found that you can connect to ADC camera’s using the open source iSpy software after installing VLC, https://www.ispyconnect.com
You first have to add another account to the camera, i.e. factory reset it login with the default (root, adcvideo) and create a username and password to use with iSpy.
I have tested that you can record a stream using iSpy, while still getting notifications from ADC.
However I haven’t had much time to figure out how to access the HD stream yet, It might just be a matter of playing with the config.