How does Meirelles achieve an authentic feel in his camerawork?

1) How did Meirelles capture a documentary tone to this film? Please discuss camera work, editing, locations, choice of actors, etc.

2) Make an argument about authenticity. Is cinema supposed to strive for authenticity? Or is it supposed to be a alternate reality for escapism? Or perhaps motion pictures should strive for both?

3) How does Meirelles achieve an authentic feel in his camerawork?

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