Minh already suggested gtk-recordmydesktop (in the other thread), but
I'd like to add that you don't need anything fancy to place video of
yourself on top of the screencast, you can just place a small window
with the video from the webcam above the browser.

For example, in debian or ubuntu, open "gstreamer-properties" and
"test" the "video input". Place that window "above all others", choose
the size and place it where you want, then record a plain vanilla
screencast. vlc almost works, but mess up the audio for
recordmydektop.

If you choose the settings carefully and remove 3d effects, you can
record with any computer. But of course, if you're doing heavy
computation, the video may not be good. A simple solution might be to
connect to the sage notebook in another computer. Not necesarilly
better than merging two separate videos, depending on your experience.

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