From Wikki (not specific to France):

""Photographing private property from within the public domain is legal, with the exception of an area that is generally regarded as private, such as a bedroom, bathroom, or hotel room, where there is a general expectation of privacy...Should the subjects not attempt to conceal their private affairs, their actions immediately become public to a photographer using an average lens or video camera....

....The United States enacted the Video Voyeurism Prevention Act of 2004 to punish those who intentionally capture an individual's private areas without consent, when the person knew the subject had an expectation of privacy.Additionally, state laws have been passed addressing the issue as well.""

France privacy laws