Media gone, replaced with BIF files

Edit your Movies library
go to the “Add Folders” tab
look at which folder location the library has been pointed at.
Copy this location into here.

Go look at the Windows registry. (regedit.exe)
Go to the location mentioned in this post [HowTo] An extended guide on how to move the Plex data folder on Windows
And look for the string LocalAppDataPath. If it exists, look at its content. At which location is it pointing? Copy this location into here as well.

Now go look at the configuration of your CCTV software. At which drive and folder has it been pointed to store and organize the recordings?
Copy that path into here, too.