What a great knee friendly technique! This clip should be mandatory viewing for all who say they can't ski after ACL surgery. It's got smooth fun written all over it.
For this pitch of slope, your speed and your medical history we could make some minor tweaks and improve performance a little bit, but frankly it would not be worth the effort. To improve performance a lot, we're going to need to be more athletic and that means working the knees more (and other body parts too). Some people might say that is too risky, others might consider it part of the rehab process. That's a choice you need to make.
Should you decide to go more athletic, the first thing I'll echo is TDK's comment to finish your turns more across the hill. You don't need to on this pitch, but you do need to if you're going to turn up the performance level. Second, you've got some great angulation going on in the turn, but you are getting there with more of a lateral move. We want to see the move have a forward component to it so the hips move diagonally forward into the direction of the new turn. To facilitate this, we need to have the legs work more independently. While you are moving forward, your inside leg is going to bend while you're outside leg gets longer. (remember I said you'd need to work your knees more?) This kind of skiing is going to generate some "G" force in your turns.
In your current skiing, you can see your feet get closer together at times to facilitate the lateral motion. You can also see parts of the turn where you get on edge and ride it for a bit before moving for the next turn. The short term improvement goals will be to keep the feet a constant width apart and to be making continuous movements from turn to turn. You'll get these results by finishing your turns more and adding a forward component to your hip movement during turn initiation. There are lots of exercises that can get you started on this path, but I'd rather see you working under the watchful eye of a pro. You don't want to re-injure your knee.
BTW - Here's a recommendation for the videographer: Use the zoom and the auto-focus.