Recording modified webcam videos

Hi there,

Is there a possibility - instead of attaching a camera [via ns.attachcamera()] to a netstream - to "attach" e.g. BitmapData to netstream. The reason is, that I use BitmapData's .draw method to get the webcam video in order to change it, such as with the .treshold method. And I want to record and save these altered bitmaps (as a video) on the FMS instead the original webcam video.

This URL gives a good example what I mean!! ...
http://www.adobe.com/devnet/flash/articles/webcam_motion.html
Two videos are shown, the left one is the original from the webcam, the right one the "modified" video. Only the modified video shall be recorded via the netstream .publish method.

Thanks for any help.