You're pretty good, nice leg position. There are a few things I noticed, however:
From what I can see, you have almost no release. While going over jumps, you need to move your hands forward on your horse's neck so that you do not catch him in the mouth and/or restrict him. On the approach to the first jump, you really seem to be absorbing the canter with your upper body and almost pumping your body. Stretch your heel down and try to absorb the shock with your legs, and try to keep your upper body more still. Your upper body is doing way too much work. Keep it quiet. Also, during the approach, bring your hands down closer to your body.
Over the first jump you seem to plunge almost into your horse's neck while going over, possibly jumping a little bit ahead of the motion. Instead of lifting your seat so high in the air, bring it closer to the saddle and open your hip angle. In other words, don't come quite so close to your horse's neck. Bring your head and chin up as well.
Another thing is, you need to bring your heel down. I thought your leg position was rather nice, though. Good heel/hip allignment.
Other than that, I don't really see anything wrong. Your a good rider. Good luck and happy riding. :)