More details will be given to people that get in touch with a quote but please see an outline below so you can give best estimation in terms of costs:
iOS iPhone application which is all based on video.
A discovery window where you can see videos, the ability to add own videos to existing videos...
The ability to create their own video, name it and share it.
Ability to share own videos that user has contributed to which links back to the app.
Ability to search for videos by keyword
Profile page which shows users videos they created as well as videos they contributed to.
Let me know your thoughts on this :-)