I was frequently asked if I can hide TV Cables inside the wall, my answer is "No", and usually I advise him not to do so. In fact, if you still really want to do it and pay for it after you read this article, My answer is "Yes, we can". The following picture is sent to me by one of my customers. Yes, it looks amazing, but it is just a virtual illustration, that is all! You should know the story behind it. You should have a common knowledge of the drywall, and know what inside the wall behind the plasterboard.
Firstly, it is almost impossible for you to make the TV cables in and out of the wall just at the sites you wish because of the cross wood beam(nogs) running through the wall. Of course, the cables can break through the cross wood beam (nogs) if you are willing to pay more than $200, maybe $500, depends on what is inside the wall and the structure of the wall. You have to pay more money if the wall is filled with heat insulation cotton, sometimes it is an impossible task to make the power plug of your TV pass through the heat insulation cotton or cross beam inside the wall. Unless your house is a new building, and the electricians have built the channel or the way to hide the TV cables before installing the GIB board of the wall.
The second disadvantage is flexibility, especially, when you are using a swivel full motion TV wall mount. Sometimes you may hope the cables to be shorter, sometimes you may hope it to be longer, Sometimes you may want to add a new cable, Sometimes you may want to remove the TV and all the cable from the wall, who knows. If the TV cables are inside the wall, it will be a hard job to do any change. A true story, one of my customers had to cut the TV cables inside the wall when he removed his SAMSUNG Frame TV from the wall and relocated it from Australia to Auckland.
In fact, you can think about concealing or covering the TV cables with the following solutions. It is much more flexible, cheaper, and easier. Usually, it takes just $15 -$20.