First we need to convert the video to a Computer friendly format. Software I used to do this was Handbrake, Dr. Divx or AVS4YOU. Once converted you will need software that can turn the video frames into jpeg. The software I used for tis was from DVDsoft http://www.dvdvideosoft.com/ Free Video to JPG Converter 1.8. Another alternative is SC Free Video Decompiler unfortunalty I dont have a program for other platforms to do this other than windows but if anyone knows of software (free if possible) for any other platforms comments would be great.
Once the frames have been exported I used a tool called "Google Picasa". This is a brilliant tool however, on startup it wants to scan your whole computer or just documents (version 3.6), it will not give you an option on just one folder however, there is a solution. Start Picasa and select what ever option you want, then under "Tools" go to "Folder Manager" from here you can tell is to "remove from picasa". This way face detection will only work in the folder you allowed. Once the faces have been found you can then select the faces you want and export them. All done.