Among the many new documentaries that incorporate home movies, there’s one titled Son of Rambow out now. From Wikipedia: 

“Set in “a long, hot summer in the early ’80s”, the film is a coming-of-age comedy. It tells the story of two schoolboys who are inspired by the film Rambo: First Blood to make their own action adventure film, which they hope will win them a young film-maker competition. Neglected youngster Lee Carter (Will Poulter) — the worst-behaved boy in school — has access to the home video equipment used by his bullying elder brother’s video pirating enterprise.”

The movie’s site is here.