Please give me some ideas how to do air gestures controls? (video inside)

Hello guys, I just seen some cool video:

Can you please give me hint how it was done? I would prefere Unreal Engine to make it, is there any way now in UE to make simillar projects?

Uses something like Kinect or Asus has a similar type of sensor. I think there’s a Kinect plugin for UE4 but if it doesn’t have a feature you want you would have to add that in yourself.