I am not sure what is supported by linuxmce, but linux supports video input card based on the Conexant BT878 video capture chipset. I believe linuxmce is using Motion for the surv. cams.
I checked Motion wiki but just found a list of working cams. You can check V4L to see if a cam is working in Linux.
I have used my Kodicomm I got off Ebay with Zoneminder (another linux cctv app.) Have my fingers crossed it will work with LinuxMCE. (it should.)