Thanks. When I say recessed, I mean built in. Like your microwave that's built into the cabinets. For the TV I would like to build it into the wall so it does not protrude out at all. Completely flush with the wall.
You will have to find out what is in your wall before you can guarantee this is possible. If there is any mechanical in the wall (HVAC, electrical, plumbing, etc) you are outta luck, moving these are a lot of work.
If it is an exterior wall, don't do it. Removing insulation from a wall and putting in a tv will create a condensation point or at the very least a money pit.
If it is a bearing wall you will have to put in suitable beam and support. This is something that should be determined by a professional.
If everything is clear to this point I have used 3/4" ply tight to the other side attached to stud material. Then attach the mount with 3/4" * 12 metal head wood screws.