There are likely others that have greater experience in this area than me but I think it seems that your dog is being a "brat". I think the dog needs to understand that it is not ok for him to bark at people because they stand up or enter a room without his "permission."
My puppy is 4.5 months. Members of the household are able to take toys from him or pick up treats on the floor without any reaction. But yesterday at a training session, a trainer was showing us how to get him to be less mouthy when receiving treats. One treat fell to the ground. As the trainer went to pick it up he growled at her. She applied a quick leash correction and continued to feed him.
My point is that maybe a firm correction might get him to knock off what may be more attitude than "fear". Since he doesn't do this to people who ignore him maybe its just a matter of him expressing himself. This is just food for thought.
As for the videos, I couldn't make the connection between your issue and the behavior they were trying to remedy.
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