Madonna's thing is just a hologram. You can see she bypass that screen. Kinda same technology here
Nash video was a hard work. They cut Steve's body and put it again, on top, if you know what I mean, my English is very limited. But it's clearly a green screen.
It's footage of Steve Nash 14 years ago. Someone behind the scenes pass the ball to him, he dunks, and hits that 3.
Look at Steve, no eyes or any contact. There is nothing else just Steve in that Footage. First ''pass to Steve'' was a piece of cake. Kid pass the ball to Steve and about 0:02 ball disapears from the view (above footage). Then, they cut Steve Nash, thats why it looks kid stands behind him. And finally, 9th symphony starts. Look at 0:20, just before Steve steals the ball from the kid. Kid is like a frozen, he clearly posing. His hand must coincide the position Steve catch that ball. And kids reaction. He reacts too quickly, he just Turn his head around and try to stare at the imaginary ball.