For more than two decades, filmmaker Kirsten Johnson has traveled the world with her camera capturing footage for documentaries. She filmed the desperation of war-torn Sudan and the stories of sexual assault victims in the American military; she followed French philosopher Jacques Derrida as he tossed out bon mots. Now, she’s cut some of that footage into a film of her own: a meditation on what it means to turn a camera on the world, aptly named “Cameraperson.”