You need to know if the brick wall has frame-to-mortar line anchors. These are used every foot or so to secure a brick wall to the studs. They look like corrugated steel plates about 2 inches wide and 6- inches long with a 90 degree bend.

One side fastens to the stud with screws and the other is laid over the brick level in the mortar line. If the brick wall is one layer thick and fully free standing, the torque of the TV being swung away from the wall MAY fracture the wall.

Do you have a camera view system you could use to look inside the wall to see what the support structure is for the brick?