I'll say this before watching the video. Barrels.
1. Improve by improving contact first. Focus on drills that bring the barrel to ball, setting contact point per location (inside, middle, outside) then blend that to live pitching practice, driving the ball based on where it's pitched. (when you can hit the ball when it's deep, then you can begin to hunt it out front)
2. Improve approach: swing at good pitches and understand how much that changes based on count. Know what a pitcher is doing and his tendencies; eliminate pitches in logical situations. Know how he got you out last time.
3. When you know you can consistently make decent contact 0-2, then you can take bigger chances for power in beneficial counts.
4. Strength: the stronger you are the better you can control the head of bat.
If I were in front of scouts, I'd first prove I could hit, then I'd demonstrate power.