If I recall correctly, didn't Swissar install some sort of video monitoring system in their a/c after the on-board fire (Flight 111??) resulting in the loss of the a/c?
I'm sure I read somewhere that they had.
And as Globaliser has said, it's something that's been looked at for quite a while.
Though wish that nosewheel cams were mandatory on all jets operating RPT!!!
Sky