PANNO made one that works with "Video For Windows" compatible Devices, originally thought for Webcams in 320*240*24. PANNO also made one for 640*480, you might contact him.
http://www.napalm.de/webcamdll/webcamdll.rar
Also check this thread:
http://www.blitzbasic.com/Community/posts.php?topic=27007
http://www.napalm.de/webcamdll/webcamdll.rar
Also check this thread:
http://www.blitzbasic.com/Community/posts.php?topic=27007