Rapid scene change on iPhone video

[piatti]

When you make a video with an iPhone, how do you make the screen change to different scenes without moving the camera? Like here:

http://www.youtube.com/watch?v=BqUviZn8l6o

Also how do you make the iPhone movies appear sideways so that there is no huge black space?

 

[Consultant]

Hold iPhone horizontally.
Use iMovie App (it's call editing).