“Hip-hop is about people,” says the journalist and director Sacha Jenkins, who has dedicated much of his life to documenting the art form. Jenkins, along with co-curator Sally Berman, last week opened the landmark show “Hip-Hop: Conscious, Unconscious” at the Swedish photography museum Fotografiska’s Park Avenue outpost. As you first step into the exhibition, which runs in New York through May 21 before traveling to Stockholm and Berlin, you enter two rooms that feature striking photographs of people who saw hip-hop’s birth. Only a few of them have any significant name recognition, representative of a time when “hip-hop wasn’t conscious of itself,” Jenkins says. These images solidify that hip-hop was…