Link your content to the real world. If you can use a web browser then you can create your own mobile AR experience using buildAR.
buildAR is an app with which you can manage the Augmented Reality contents, that is insert any type of content (text, video, images, etc..) overlaid onto the real world.
This technology is already used in various sectors, ranging from educational, artistic and cultural up to entertainment.
A technology that can also be a great documentary tool or at least for a certain type of documentary.
It is not long ago when we dealt with ARIS, the open-source platform with which was created the situated documentary "Dow Day" (http://bit.ly/Sz5Q8a)
A fresh and intriguing example of how buildAR can be used is "Notes for Walking" developed by Megan Heyward (http://bit.ly/Q8I6ZW).