You could try to film at 15 fps or so, edit as normal but use some filters (real time that don't require rendering on the timeline) to reduce the brightness, contrast and/or saturation of the footage. (Cineform filters for me in Premiere Pro) Then export to an intermediate AVI and import into your video encoding app, or if you prefer encode straight out of your editing app to a final format like WMV, MPEG or Flash with a low video bitrate and mono or low bitrate audio as well. That should do the trick. You can even add something like a running timecode on the video (plug-ins exist for this in Premiere Pro) or a border or frame around the video like you sometimes see on security camera footage to give it a hidden camera look if you want it to look like that. I would also make sure that you keep the camera in a fixed position so it operates like a real webcam as well or give the girls a remote control they can point at the camera to operate it like a cam girl does.
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