App Demo Videos with Touch Gestures

Hi all, Is there a dedicated product out there which helps to create App Demo Videos, including touch gestures (such as taps, swipes, pinches, etc)? i've not come across one for iPhone and the only alternative I can think of it manually editing them in, requiring a fancy video editing software. Wondering if anyone's got a solution? If not, do you think there's space in the market for this as a Product in itself? Thanks!