I tried this and had a couple of reasonable results (and a few discarded duds):

    https://www.earth.org.uk/AI-promo-video.html

Though I am annoyed by current AI hype, given that I'm writing a lecture about tech sustainability, I thought that I'd give it a try. I have made real videos with real people for (eg) crowdfunding, and I am well aware of time and costs, so this would not happen at all without similar short-cuts. Thus I don't think that I am stealing bread from any creatives' mouths. What I can't see is how much energy and CO2 each ~90s video generation run costs...