In Sweden we are not allowed to pull a power cord inside a wall like that πI wonder why Hiort? No danger at all if it is properly installed, shielded and insulated. If the electrics are up to date then any problem would cut out within in hundredths of a millisecond, which is so quick that there's little to no chance of a fire or any other related problem. I have had a complete rewire done in my current property and its all between the plasterboard and original brickwork and 100% certified as safe and legal to UK/European standards. Simon.
Not in the US, either (https://gizmodo.com/5297352/your-wall-mounted-hdtv-probably-violates-electrical-codes). Then again, we build out homes out of very flammable sticks.
Stan