Multiple tools will cut into brick walls. A hammer drill will probably get this task done the quickest, as it is specifically designed to pierce holes in brick and make large cuts. \
The hammer drill is a power tool, so it requires less human power to get it to work. \
You can also pre-drill holes with a masonry drill bit and a power drill. The holes will make it easier to cut into the brick with a diamond-coated hole saw and a masonry pilot. \
You can also use a masonry chisel to cut bricks by hand. However, this is typically only used for very fine detail brickwork, as it takes a lot of personal elbow grease to chisel away at a brick wall. \