You can find various kinds of performers across the river from the Eiffel Tower, over at the Trocadero, either up on the esplanade or down around the fountains. As for film, head to Avenue Beaumarchais, between Place de la Bastille and Place de la Republique -- that's the main area in Paris for camera shops. Or ProPhot on Rue Condorcet -- they have a great selection of film:37/39 rue Condorcet
75009 Paris
01 42 80 58 41