im not able to watch the video but from what it sounds like you drop the balls in the container from the top? i would make a raise and lift arm to pick the ball up and when you get to thecontaioner some way hit it on it so it will fall in...
it depends on the amount of funds that you have backing you...
Also i think i would use tracks and if you had enough room maybe make htem double wide on each side to try and get all the traction as possible...
Good Luck!
My last year was last year are the balls the same?