Do you mean that for blob detection to work, the Desktop Experience needs to be installed?
I migrated from a Win 2008 R2 server where Blob detection was working - I copied the configuration files from this server to the new server so the camera setup is the same. Which is why I assume it is something missing on the new server. I have FrameDifference working on the new server.
The setup on core was pretty straight forward. I suggest logging in locally and using the sconfig program to do the initial server setup and then install “Windows Admin Center” on another machine to remotely manage the server. Windows Admin Center Overview | Microsoft Learn
The only real issue I had was with the user I created for the service to log in with. I had to use a powershell script to set the “log on as a service” permission. There are plenty of scripts out there like grant_logon_as_service/Grant-LogOnAsService.ps1 at master · ivadim/grant_logon_as_service · GitHub
I could run NCS X to activate the licence with no problem.