You have to be very brave to attempt to repair that. Some of it depends on being able to separate, strip and solder wires that probably weren't meant to handle the heat of the iron. Also if you are watching 4K TV it is high speed and a lot of data on the cable.
A high probability of causing some interference with the signal. Too bad it's in the wall, I think Monoprice has a lifetime guaranty on their cables but it probably wouldn't cover an accident anyway.