Yea, it’s easy to do.
The hardest thing is fishing wires through the walls if you’re trying to hide them, or just install the white “wall” conduit on the outside to make it look clean if you don’t pull wires.
Is the fireplace Brick or Wallboard? If it’s brick, then I recommend just putting some of the “conduit” to make everything look clean. If it’s wallboard, then you can either do the conduit, fish it depending on the fireplace setup.
If you need some help, let me know; I completely wired my living room for 5.1, lights, and A/V. Mounting a LCD’s easy compared to a 9’ electric screen to the ceiling, a projector to the ceiling, and all the associated wiring…