What do you think?
Probably real, but not as close a call as it appears. The helicopter was obviously there to observe/film the surfers and wouldn’t be positioned right over the wave. It would be leading the wave by several yards. The fact that it’s a really small copter helps create the illusion that it was closer to the surfer than it really was.
The surfer didn’t hit the helicopter.
The video was shot with a telephoto lens, compressing the image so that it looks like the helicopter and surfer are in closer proximity than they really are.
Elmer J. Fudd: ‘Really small’? That’s an MD 500N. Specs say it has a crew of one and will carry six passengers. To me, that’s pretty big. (I’ve flown Robinson R22s and Schweizer 300s, both of which are two-seaters.) 
Check. Telephoto lens. Not microcopter.