My tv is stuck on video

I do not know your original problem.
If you are inputting video by the Scart connector the television will automatically read that input because the Scart has a priority, pin 8 I think, which will be at 12 volts when the video is not in standby.
Unplug the scart lead and the TV should revert to Recieved channels.
If this is cable connected, ie. not via an aerial, then I have not an answer, try the cable company.