DOCUMENTARY PREMIERE: Bryan Fogel, a cyclist and a filmmaker, learned firsthand what many good reporters learn while investigating their subjects: Go where the story takes you, even if you didn’t expect to go there. In his case, he set out to make a film about the effects of performance-enhancing drugs, and intentional doping, on athletes in the cycling world. What he ended up doing was uncovering proof of a deep-seated, organized doping scandal by Russian athletes at the 2014 Olympic Games. And in Russia, breaking that kind of story can be dangerous to almost everyone involved, as Icarus, which made a big showing at the Sundance film festival, shows.