Hybridoco
A form of DocuFiction, this is a film genre which attempts to capture reality such as it is (as direct cinema or cinéma vérité) and which simultaneously introduces unreal elements or fictional situations in narrative in order to strengthen the representation of reality using some kind of artistic expression.
Check out some of the further reading at;
https://www.writersstore.com/documentary-
https://www.desktop-documentaries.com/storytelling-techniques.html
http://www.indiewire.com/2014/09/michael-moores-13-rules-for-making-documentary-films-22384/
http://www.danmccomb.com/10-tips-for-shooting-a-documentary-film-using-fiction-techniques/
https://www.desktop-documentaries.com/cinematic-techniques.html