Faye, Im presuming that any videos posted will be random ones pulled from the internet.
OP, as Faye said - people are more inclined to ask members with genuine experience, than someone who just wants to post dressage videos.
Chiilaa - as well as the duct tape and draw reins, try carrying a bat so every time the horse puts it head up you can smack it on the poll - itll learn quickly to hold its head all pretty like :)
Also, try the 'yank and crank' method. Kick really hard, preferably with a god, sharp set of rowleys, and then lean back a bit of yank your arms in a see-saw motion. This will get the hind legs active, and give you that pretty headset. Don't worry if the horse rears - that means its really engaged- like those rears they do in the spanish riding school