Remember that, like any change, people need time to adjust and build familiarity. Just like getting a new project team up and running, companies or teams that go into heavy video conferencing mode go through the phases of "forming, storming, norming, and performing".
The first phase is where the team or group that is going to be using the technology decides that this is the technology they are going to use to do their communications. Sometimes people aren't given that decision, though, and it is made by higher levels and they just have to live with it. During this phase, you introduce all the participants to the technology, show them how to use it and try to eliminate some of the "fear factor" inherent when people use things by themselves for the first time.
The next phase, the "storming" phase, is one of discomfort and distrust. Not only with the technology where they might not know exactly how to work everything or what to do when things go wrong, but also of the people on the other side of the transmission line, especially if they haven't worked closely with them before. In this phase, sometimes people will not turn on the camera, saying they are having technical difficulties or will put a picture or stuffed animal in front of the camera instead of training it on them selves. This is due to the desire for some people to want to remain anonymous until they feel more comfortable with the process and people. This can last a week or so, until people get more comfortable with the new mode of interacting.