It primarily uses fixed positioning, and javascript.
But it does look just like that NFUSZ videos - and includes click to website, interactive voting/forms (it like the UBID stuff), telephone call to action, and overlapping appearing/disappearing events. Anyone proficient with javascript can do it.
The bare bones code of raw inserting clickable links, forms, etc, I can see taking less than 1000 lines of code. The telephone call to action seems a little more involved to actually get the call to place.
The products built around that code adding all the add-on features, AI, event logging, etc, starts adding up though.
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