Here's how to get this accepted by the public:
Wait until it demostrates its abilities. The media runs glowing stories about this new technology and its potential to make us safe.
Wait until some parolee commits a horrible, bloody, violent crime--preferably against a child. Send out the "goverment as father figure" advocates across the media to ask: "Why didn't we use the technology we already have to save this child's life?" (Bonus points if the child is non-white, because then the answer is already implied.)
Pepper the various media with stories ridiculing the "conspiracy theorists" and right-wingnuts who would rather see Americans die than to make "reasonable use" of this technology to protect children from predators. Be sure to stress the point that there have been tens of thousands of cameras in use worldwide for years, and the sky hasn't fallen yet.
Push-poll Americans as often as possible, reporting on each poll that indicates that a majority want these "reasonable steps" taken to protect our children from predators.
As soon as it looks like most Americans have been softened up: Run a story on "60 Minutes" and print one in the N.Y. times detailing a series of horrible crimes which could have been prevented by making "reasonable use" of this technology, followed by a quote from a liberal senator who just happens to be sponsoring a bill making such reasonable and compassionate use possible.
Wait till the next bloody crime against a woman or child is commited by a felon, then:
Publicly push the bill through congress on the wave of emotion, and embarrass the President into signing it. (If he even hesitates). Assure the public that it only is intended to keep felons from killing children.
Watch everyone go back to sleep...