As long as they provide a standard way to grab a JPEG image, and send it back as a buffer of some sort, it can be used with LinuxMCE...
Take a look at the Panasonic IP Camera GSD, for an example. It emulates an HTTP request to get the image off the camera, but the code could be adapted in other ways... Make a new device template with similar code, attach a pnp record to it, and voila, plug and play with LinuxMCE.
-Thom