i spotted 2 flaws. #1, you are standing on one leg, all of your weight is on your back foot. as pudds observed earlier.
try: jump into the box, now you should be balanced, the center of your weight should be your belly button, equal on both legs.
don't stand up straight, bend your knees a little, kinda sit in the box, you have your legs locked up, that takes them out of your swing. with your balance centered, when you lift your front leg you should notice that you are falling forward. at that point push off with your back leg into the ball, stay with the fall into the ball, you already have a good follow thru.
notice i said lift your leg & not your foot, when you do, you will feel what i mean.
suguestion # 2: i notice that the top of your bat lays back tward the catcher and then you sweep thru the ball.
make the top of your bat move forward over your head and then swing ...everything is forward
pratcice to get your timing mechanichs it will all come to you
i hope i could help, i think all you need now is a better camera try these and let us know what happened