Golf swing is a very athletic move, so you should stand like an athlete behind the ball 
It seems like you’re sitting on a chair.
Thought you were just going to fall over like Chevy Chase there toward the end.
Your actual swing mechanics and hand-eye to hit the ball are super solid. You’re just standing like a foot too far away and your posture is wrong. Need almost completely straight legs with a bend at the waist and straight back. It’ll feel like you’re going to fall over for a while but you’ll feel it eventually.