Well, Mass is public worship number one, with no expectation of privacy since it is the public prayer of the Church, and, two, if something like a liturgical dance is being performed, Mass has been suspended to provide entertainment. If I am at Mass and they stop Mass to have a liturgical dance on the altar, am I really filming the liturgy or something that is interrupting it?  It's not like whipping out a camera phone to snap a picture of Our Lord during the elevation of the Host. 

Since comments are now civil, I congratulate you for not putting Jay in scare quotes.