Hello!
Let me try to clarify it a little. I'm using cable tv + internet package. The same cable is used for both. When we moved here, I was told that the security camera feed is also connected to the same cable. Now the cable doesn't go directly into my tv, but into a receiver we got from the ISP. There, I can watch only channels I'm subscribed to, and I can't scan for other sources of image (such as a surv. camera). Using only the TV, without the receiver, I did re-scan for channels, but I couldn't find the feed from the camera.
Another piece of that cable goes into my modem, which is connected to my pc via lan cable.
Hope that helps, thanks a lot!