Yes, they can be mounted piggy back via a 1/4" camera socket.
The available backfocus doesn't allow directly the use of a DSLR. A webcam at prime focus usually works well. It is possible to image narrower FOV using a barlow/ powermate and a DSLR.
IMHO I'd start with a webcam....
Have you seen Jan Timmermans page??
http://www.thefirmament.nl/astro/main_screen.html