"Reasonable expectation of privacy" is refers to whether you are performing something in public or not. I can take a video of you standing in Main Street shouting about Hell opening up and devouring us all, because you don't have a "reasonable expectation of privacy."

However, Wikipedia [1] implies this is not civil, but in regards to the government's view of privacy to you, not yours to the government, and is highly unlikely to supersede areas where filming is expressly forbidden, and which is indicated to you when entering that area.

[1] http://en.wikipedia.org/wiki/Reasonable_expectation_of_priva...