In my case, "192.168.1.100:80" shows a composite of all 4 cameras, very nice when glancing at Veramate on my phone.
Using the DVR plugin, you append the ip address with the individual camera names and you can get individual cameras feeds, assigned to a room, for instance. You can also have Vera arm Blue Iris and have Blue Iris report movement to Vera.
It works well, it is a little complicated, but the "how-to" manual is within this forum but it has been too many years now for me to remember all the steps.