Convert security camera/NVR output to ATEM Mini Extreme Iso

I'm attempting to use security cameras as part of my ATEM mini extreme ISO live production...regular HDMI/4k video inputs nicely, what do I need to do to include security cameras?
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=4&t=202798