Stop the video at :13 & :14 seconds. See how your hips are behind your feet. Bad.
At each turn transition when you are light on your skis, strongly pull both feet back behind you. The steeper the pitch, the stronger you must pull them back. All during every turn strongly pull your inside foot back, all the time, every turn. Try lifting your insteps up inside your boots...not your toes, that tenses the foot muscles. All this will get your weight over the front halves of your skis and allow the skis to work the way they were designed to work.
:20 seconds--note how you are inclining inward. :21 seconds and other places--note how your upper body is turning with the skis instead of turning the other way. Balance out over the left ski when you turn right...twist your hips & shoulders left when you turn right, and vice versa...I know, the opposite of what we do for just about every other activity. Do this after you get yourself balanced over the balls of your feet--hold both poles firmly. Hold them way out to the sides, almost straight armed. Drag both poles hard on the snow through several turns...several runs until you've acquired the habit of balancing over your outside ski. Add to this...counter-rotate your hips & shoulders toward the outside of the turn. Drag both poles hard on the snow while you swing your body so your inside hand is just about over the tip of your inside ski and your outside hand is straight down the fall line from your feet. Your turns will improve 200%. One more drill--while traversing, lift the tail of your uphill ski off the snow about an inch or two as far as you can. Get so you can keep it up just about all the way. Now do that while making turns; lift the tail of the inside ski off the snow as far as you can. At the turn transition, shift and lift the outside (presently downhill) ski tail off the snow, hold it up, then turn. This drill will allow you to find your balance over your outside ski and you can put as much or as little weight on the inside ski to give you the performance you want.
Using only the muscles in one ankle, tip the ski to lift the big toe edge up in the air (invert the foot) and the little toe edge stays lightly on the snow. Tip the right foot up to turn right; tip the left foot up to turn left. Tip it smoothly and progressively more and more and more as the turn progresses. The effort is only in the ankle, and allow the knee and hip on that side to drop toward the snow all the while shortening that leg.
So, one thing at a time. Get centered fore & aft. Then, learn angulation with the hard two-pole drag. Then, learn angulation plus counter with the hard two-pole drag and upper body counter-rotation. Then, learn balance over the outside ski. Tip, tip, and tip more and flex the tipping leg. You'll like the result. Please let us know your results.