I can only remember a scene and there are two guys in a room one of them has a big hole in his abdomen. The other guy shoves something inside the hole. The first guy starts to grow what look like tentacles around his arm and body. I've been looking for this film for ages. It might have won some international obscure awards but I'm not sure.
I think the scene you are describing is a key scene in the movie Videodrome with James Woods, Debby Harry, and Les Carlson
Renn goes back to Channel 83 station and shoots both Moses and Raphael in the Channel 8 boardroom, his gun/hand now a single organic fusion.