ABOUT CHROMA SHOOT
Chroma keying is basically a Visual effects technique for layering two images or videos streams together based on color hues. Basically the shoot is done in front of a green screen and then the background is changed in the post production by visual effects. We can fully change the scenario of the picture by the visual effects. Its quite a fun shoot and outcome images or videos of the shoot after visual effects is completely different from the actual shoot. We can adjust and choose the background according to our wish.
Chroma keying used in many movies, you would be shocked to know the magic visual effects.
Check out the movies shot with chroma screen background- http://www.videotailor.com/blog/making-movies-chroma-background/