There is no direct support for cccam in tvheadend. You could use the capmt part of tvheadend but that code is no longer maintained, and schedules to be removed in future versions. Tvheadend supports cardservers that use the newcamd protocol like newcs or oscam.
If you really have to use cccam then you might be able to use oscam as a "proxy" between tvheadend and cccam but I would suggest to find a way to switch away from cccam.
Hein