You're not going to see CCTV on the flight deck for decades, at least in the US. All of the pilots' unions have fought strongly against it. They did similar for the cockpit voice recorders, and only agreed to it when the FAA/DOT said recordings can never be released to the public. This was brought up at a speech by Captain Sullenberger I attended. He said even his own wife was not allowed to listen to the recordings. He also said the transcripts of the recordings aren't verbatim, but kindly leave out some choice words.

On aircraft, what I don't understand are the lack of CCTV cameras to show areas not visible from inside the aircraft. My car has 6 cameras around it. I can see the position of every single tire, the edges of each bumper. Even the most expensive aircraft cannot. If I were a pilot, I'd really like to be able to visually confirm from the cockpit whether the cargo hold FIRE light is real or due to a failing sensor. Likewise, after a hard & heavy landing, I'd like to be able to see if my brakes were on fire. The tail cam on the newer Airbus aircraft does provide some of this, but more for show than utility.