I think these are really neat. I remember years ago, one of the very first nest cams was from the top of the Kodak building in Rochester NY, it was a peregrine falcon nest. Did a quick google search and I see they're still offering the cams! http://www.rfalconcam.com/
Those nest cams are pretty neat, In portland one of our local news stations has one on a hawks nest. At first you would see the birds every once in awhile, then an egg and then another soon there was 4 now they have hatched. its a pretty cool thing. if you wanna see it its at www.kgw.com they put it up every year.
When it comes to scent, there are basically two types; those that attract and those that mask. I've tried both on many occasions. There are lots and lots of "doe in heat" scents, designed to attract a big buck into range. I've also used a "cow in heat" scent while elk hunting.
Another scent would almost be better named as a "coverup smell". The main goal is to cover up human odor or mask it. Though I don't believe you can ever totally eliminate all human...