Possible to set a downloaded You Tube video as SCREEN SAVER on home screen in Blackberry?

Possible to set a downloaded You Tube video as SCREEN SAVER on home screen
in Blackberry?

I am working on an application in which I need to download the You Tube
Videos from my application.
By using these videos I have to set them as an SCREEN SAVER.
Can we download the videos from YOU TUBE programmatic?
Can we show them as an SCREEN SAVER on my home screen?