Is there a special video capture card or devices required?
The capture card just needs to have a WDM Video Capture Driver. This is simple to test: open the camera settings dialog in the Flash Player on the system in question and see if the card appears in the list of video sources. To open this dialog, make sure you have Macromedia Flash Player 6, right-click while viewing some kind of Flash content, select Settings, then click the camera icon.