I need to know how to record a video of an iOS app running for promotional use. Could anybody please help me with this?
There are two ways you can do this. If you want to run your app using the iOS Simulator, then you can use audio/video screen capture software such as http://camstudio.org/ or http://www.techsmith.com/camtasia.html.
If you need to record a video of the app running on the iOS device, then that would require a slightly more complicated setup. You will need Apple TV http://www.apple.com/appletv/ and a DVR. You would connect the Apple TV to a DVR, then from the DVR you would run an output cable to a TV or monitor. The iPhone and Apple TV needs to be configured for mirroring. Afterwards, you should be able to project and see your iOS app running on the screen (over Wi-Fi) while you are recording the running iOS app on the DVR.