Good comparison of the state-of-the-art text-to-video AI tools. The sample results look decent, although very short - probably text-to-video still has a long way to go for producing long videos. Meanwhile the technology to add talking avatars to videos is mature, and I believe it's practical to use that for enriching existing videos, and developed a tool called VideoPlus Studio (https://videoplus.studio), go check it out if interested.