That was a pretty good video! It wasn't quite the quality of what is usually seen on TV, but I really liked it.
The only time I hunted bear, we weren't able to get up into tree stands - it wasn't legal in my state at the time. We were in ground blinds - just a bunch of logs and sticks piled up to make a little cover in front of us. We were hunting over bait, but out of 4 hunters no one got a bear.
It always looks exciting when they come right up to the ladder and look up as though they are going to climb up and join the hunter in his stand.
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...