A small production company called Stillmotion led a workshop, “Proactive Storytelling Instead of Reactive Coverage,” with tips and advice for documentary filmmakers, but their backstory was its own lesson. They started out shooting wedding videos (sometimes considered a just day job by snobbish filmmakers) with basic tools and a small team. Their vignettes caught the eye of ESPN, who hired them to film The Season, a TV series about the NFL. Now, they’re producing a feature-length documentary, A Game of Honor, about the Army-Navy football rivalry, for CBS. And they’re still making wedding videos.