I have been following this couple (and dog) on http://www.whiteblaze.net for quite some time. As many others, they started the Appalachian Trail documenting their progress the whole way. Their Facebook page is here: https://www.facebook.com/TheClimbToKatahdin?fref=pb&hc_location=profile_browser
The movie they filmed on the journey has just been released on Vimeo and you are able to rent it or buy it here: https://vimeo.com/ondemand/theclimbtokatahdin.
While it may not be a blockbuster, I enjoyed the movie and all of the extras. It is filmed in a documentary style and seems to be filmed in HD as the video quality is very good. It may not be particularly insightful, but does show the good, bad, and the ugly of hiking the trail for days and months on end.
I really enjoyed the views and experiences from the Appalachian Trail as shown by this film and hope to one day enjoy some of the same experiences. If you are interested in hiking, backpacking, or the Appalachian Trail, you may want to check out “The Climb to Katahdin.”