From the RealmPictures Vimeo page:
Dave and the team create a single shot from an action sequence using entirely practical effects, all shot on the 7D.
For a tutorial on how to create your own DIY compressed air cannon like the one shown in the video, along with 9 other action tutorials, skip along to our KickStarter page and pick up the Indie Action Pack!
Check out ‘Zomblies’ here: zomblies.com
**Probably not that useful for you documentary film makers out there… but I guess anything is possible.