There are several ways you can save a video to a computer or external drive.
Elite members can back up videos from the app to their private account. Then you can login to ubersense.com and download the videos to your computer.
Camera Roll: You can save videos you have recorded to the camera roll. Then when you connect your device to the computer you can transfer these videos onto your computer.
Dropbox: You can also upload videos you've recorded to your dropbox account in the sharing option from the app.