That looks easy enough to do in a 3D app such as Cinema 4D. You would draw a spline in the shape you would want the main ball to go in. Use the align to spline tag and animate it's position. This will get the ball moving on a predetermined path. Next Create and emitter, drop on of those spheres into the emitter so that the particles generated are now balls. Scaled to preferred size. You can attach the emitter to the sphere, but I'd suggest using the same align to spline tag. So the emitter can bank. Set your emitter speed to what you'd like and texture the elements.
That will reproduce what you see in the video. To get it to go behind people, it's just simple use of mattes in AE. Let me know if that needs further explanation :)
-N
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