play video corresponding to marker

Hi I need a Ipad application that can do the following: When the application is started it should show a startup screen (immage is provided bij me) As long as the application is running, the application should “look” (with the front side camera) if it detects a marker (probably a bar-code is most easy to detect, but I am open to other options) When a marker is detected, the application should play a short film that corresponds with the detected marker. There are a growing number of markers, so the application should be able to download and play a growing number of films. For performance it is probably best if the files are stored on the ipad, so it is faster to see a already downloaded film again. When the marker is removed, the app should stop playing the movie, show the start up screen and wait for another marker to appear. Since I have to provide the different films, it is probably best if I can store the growing number of short films on a webserver, If possible I would like to set a fixed rotation of the Ipad (so the film is always shown in the same orientation, and does not turn when the ipad is tilted. If possible I also would like to set a specific brightness of the I pad, but i am not sure if this is possible.