From the YouTube comments:
"My son posted this video, and we were on board this aircraft as passenger going on holiday! I am an airline captain flying 747s on worldwide ops so I do know a little about flying.
I actually ran to the cockpit when we started to line op on rwy 36L in AMS. The take off config was going off and could be heard till the flaps reached flaps 5.
The flight was a Air Explore, a Slovakian wet lease to TUI Netherlands.
During flight I asked to speak to the captain and he refused. I left a letter that I would inform the authorities in the Netherlands and file an ASR.
Captain did not take action at all. I contacted the flight safety officer of TUI and send the vid to them. The captain in question never filed a report or a mention in the techlog.
TUI NL filed the ASR and reviewed the wet lease. The captain of this flight was fired and wet lease terminated after the season."
No way to verify, of course.