Capture currently displayed screen as a video for recording program demos to upload to YouTube or problem recreation.
1) You can use it to create demonstration videos for any software program on your Android device.
Or how about creating a set of videos answering your most frequently asked questions?
2) You can create video tutorials for school or college class
3)You can use it to record a recurring problem with your computer so you can show technical support people
4)You can use it to create video-based information products you can sell
5)You can even use it to record new tricks and techniques you discover on your favourite software program, before you forget them
Link: Android Screen Video Capture