There are some pretty amazing skills in this video!
I can’t say that I was even aware of an activity called “dice stacking.” It’s similar to the cup-stacking activity, which has gotten some media attention, except this way more interesting.
The guy (artist/athlete/?) uses plastic cups to scoop dice off of a surface. This is fairly impressive as the dice do not go shooting across the room like if you or I tried it. However, he then shakes and rotates the cup in such a way that he can stack the dice without touching them, and even control the order.
This probably what you’d get if you crossed cup-stacking with a magic trick. Check it out.