Lots of people in lots of different jobs have to deal with being videoed. Bankers, workers in shopping centres, airport staff, workers at McDonalds, security staff, staff at bars and clubs, law enforcement officers, public transport, cabs, call centre staff.... Why on earth are pilots anything special?
The dual goals of video are to deter crime, and to provide evidence if a crime takes place.
Most people support video when they are being protected, and are less supportive when they are being recorded in order to protect others. Then it becomes an insult and an invasion of privacy......
As with many other things in society, it is a two edged sword. Again, why are pilots a special case?
Most employees have to be a bit careful about what they say and do in company time on company premises. Its called common sense and diplomacy. If you want to slag off about management, its usually best to do it in your own time away from the office. Its not that difficult.
Pilots have historically been a bit of an exception. In a 1:1 conversation well away from management, pilots have argued the right to "privacy" - while on company time, sitting in very expensive company assets, and entrusted with the lives of 100's of the company's customers.
Expect this exception to disappear.
Just like real time tracking of aircraft post MH370, the customers (you know, the people in the back that ultimately pay your wages and without whom you would not have a job) will increasingly demand video security in the flight deck.
A lot of calls going up for video surveillance.
The simple truth is that video surveillance would add very little in 99.99% of investigations. Investigators can derive a
remarkable amount of information from audio recordings. FD mikes are incredibly sensitive, and all other connected mikes (boom mikes on headsets etc) are usually recorded too on most modern types. And multiple mics allow for an impressive amount of conclusions to be drawn - such as exactly where on the FD sounds are coming from. Different switches, levers, controls all make slightly different noises - these can be examined in great detail and firm conclusions drawn in most cases.
To include video recording would require significant modifications - the recorders would need a huge capacity increase, likely needing a redesign, or the installation of an additional recorder. And a cheapo solution like a GoPro would be useless - the recorders are built the way they are, and installed where they are, for a purpose - crashworthiness - and assuring that purpose is NOT cheap.
Neither is the re-certification of ALL the aircraft so modified, to ensure that the mod hasn't introduced new problems with the rest of the carefully-designed aircraft systems.
In short, it will be a significant cost - for probably very little real benefit - even before we get into privacy issues.
A FAR CHEAPER option would be to hire more pilots - to take the pressure off already over-worked and stressed crews. And train them properly. And pay them better. And.... And...
And it would have done nothing to prevent what happened on this flight - and likely shed very little additional light on the eventual happenings.