A quick tutorial on how to export videos from iPhoto:
1. Open iPhoto and click on the event in which your video appears.
2. Select/highlight the video you want to export, in the Event Browser.
3. Select File, Export
4. In the Export window that popus up, set “Kind” to Original
5. Select Export in the lower right of the Export window
6. Choose the location on your hard or external drive where you want your video to go.
7. Your video will be exported as an “avi” file.