Hi Andrej, The only video-input related devices that are officially supported are the Brooktree Bt848/849/878 and 879 family, via the bktr(4) and USB UVC devices, via uvideo(4)/video(4).
Some 3rd party attempt at a driver for the SkyStar 1 does exist, but it's most likely out of date.. and it probably does not compile with the latest release of OpenBSD, http://www.alloyant.com/dvb/. A FreeBSD driver exists for SkyStar 2 devices as well, it's in their ports tree under net/skystar2. Probably a bunch of DVB/tuner/video related projects for the other BSD's, finding and porting them will be the hard part. Good luck. -Brynet