Hi there,
I think this App is quietly too much simple.
To choose SEBLOD instead of a dedicated component, I think there are some features missing here. The first of those is the ability to fetch the video informations from YouTube (or an another provider) to fill up the fields automatically. I really think this is the minimum to provide as service for a such App.
Then, we could think about some other great features, quietly similar to PHP Melody, as the automatic checking of the video, to be sure the videos are still available, and through a report button for users to be able to report a broken video.