You will need:
A Camcorder (Firewire or Analog)
A Firewire Card (For Firewire Camcorder)
A Video Capture Card or TV Tuner (For an Analog Camcorder)
A way to connect the Camcorder to the corresponding cards.
The Eagletron TrackerCam Software.
Go to trackerCamhttp://www.trackercam.com/TCamWeb/download.htm
to download it, it is a free download. You need additional hardware to get full use of the software, but for a basic webcam this software is enough.