"real" video calling sort of snuck in through the back doors once people got webcams and MSN / Skype, and became mainstream / common in the 2000's with always-on internet, remote work, etc. And at one point the smartphone and mobile internet got in people's hands and (video) calls became casual.
I think the other part there is that it's normal people using them. What I mean by that is that in these videos, it's all very formal corporate people. And then the first people that really get interested in this kind of technology or who have an interest in futuristic stuff are / were the "nerdy" types. (I am probably living in a bubble though). But it was the average joe that normalised this technology.