IShowU is an application that can be used to capture a video file that is being displayed on your computer screen. Audio created by different apps, not just images but also made from audio from your own microphone.
A series of predefined styles lets you record images in different video formats, including: DV NTSC, DV PAL, HDTV 1080p or HDTV 720p. According to the clip duration and the recording quality
IShowU lets you compress your videos, use the QuickTime codecs to determine the capture area, the number of frames per second, the order quality, the mouse to hide, etc.