PARIS — The April 6 protest had already been moving for half an hour by the time I found Rémy Buisine. The 32-year-old video journalist at French online media outlet Brut had given me his live location, but he wasn’t wearing his neon-yellow press armband yet and, given his outfit (a light, navy puffer jacket and blue jeans), he blended right in with the crowd — which was anywhere from 57,000 to 400,000 people, depending on whether you believe the police or union organizers. Buisine found me, in fact: He yelled out my name with a smile on his face, before getting back to business, instructing a colleague to go shoot the back of the march. Buisine has become, for millions of people worldwide, the eye into the recent French protests .…