I must say I don't like cameras on or in aircraft, I admit I have done a couple of videos probably 3-4 but it really doesent interest me.
I make one flying video and im bored, cant be bothered lugging a go pro everywhere.
I use my Go Pro's for other things and an occasional flying video.
Some people go overboard and want to film every single flight with multiple cameras such as youtube member "Mr Aviation 101", not sure why you would want to.
I think I only have one flying video on my hard drive!
A lot of people just take videos and put it on youtube to say "have a look at me" to boost there egos.
Not saying any of you guys do it but I know a heap of guys that have cameras all over the plane just to put on youtube.
I know a few aerobatic guys that use cameras but it never goes online, its just used for reviewing the manoeuvres.