There was a second camera at the back corner of the room that they cut to for a single second - but when they they cut back the first angle was from a different height and more to the left. The first camera man could be seen in the shot from the second camera and was wasn't moving.
So, the major part of the trick was shot using this undisclosed fixed 3rd camera, with an artificial camera wobble added.
I noticed that after the switch the last ball (39) was raised up slightly, not touching the perspex base of its holder, like it been put there in hurry, but I can make out at what point the switch happened.