how to take sample image frame from youtube video and use it as a background? [duplicate]

I made this project http://tinyurl.com/nowimlisteningto .This is a website that plays Youtube videos as a playlist. one after the other.I want to make my site visually nicer and was thinking of changing the background image of the site to a sample frame from the Youtube video that is currently playing.

Is it possible to do such a thing?Im use a java server and jsp files in my project, some html, javascript, css.

Edit:Here some usefull link i found.

Player Background Thumbnail (480x360 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/0.jpgNormal Quality Thumbnail (120x90 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/default.jpgMedium Quality Thumbnail (320x180 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/mqdefault.jpgHigh Quality Thumbnail (480x360 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/hqdefault.jpgStart Thumbnail (120x90 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/1.jpgMiddle Thumbnail (120x90 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/2.jpgEnd Thumbnail (120x90 pixels):   http://i1.ytimg.com/vi/HIrMIeN5ttE/3.jpgAnd additionally, the next two thumbnails may or may not exist. For HQ videos they exist.Standard Definition Thumbnail (640x480 pixels):     http://i1.ytimg.com/vi/HIrMIeN5ttE/sddefault.jpgMaximum Resolution Thumbnail (1920x1080 pixels):     http://i1.ytimg.com/vi/HIrMIeN5ttE/maxresdefault.jpg