Hi. i've watched your presentation and i think the app is quite interresting. What i suggest to do if you choose me is:
-To build a mobile app with web standards technologies (HTML5,css,javascript). they are really good in that we can make really awesome look quite easily.
-To use Google Appengine for the web service: you'll have total control of the web side with only a gmail account and can extend the hosting capabilities at your tastes (for videos,images,...).
I'm very intersseted and i'm ok to be paid when job is done. Feel free to contact me, I'm available for chat on freelancer messenger.