I am building a photo to dvd website,I am searching for a application that will allow my customers to upload there photos. Can I Do this with this App?

Generally yes. Please read this article:http://www.zenphoto.org/2008/07/an-overview-of-zenphoto-users/
And also look at this plugin: http://www.zenphoto.org/documentation/plugins/_plugins---register_user.php.html

I recommend also to read our theming tutorial.