As I understood they recorded the footage of the brass, percussion and vocal sessions seperately (like every jingle package) and montaged them into a short video. Like Ratnob said: you don't see them together.
The site doesn't tell if the session had been recorded live as a whole, so I think it was a classic session.
There IS however a new late night show in which the Top Format band and singers do a live session every week. It's called GIEL (the tv show of a populair radio morning host) and you can find it on
http://www.uitzendinggemist.nl/index.php/aflevering?aflID=5158738&md5=1df3138a6b00a33b1b09a5534ba96094
Just click it and then click the orange button below ('bekijk uitzending'). Enjoy!