I see a lot of cool, even realistic graphics here related to AI technology. What programs or online versions do you use to generate them? Or maybe you also know AI video generators?

IDK about apps or sites anymore, but if you have a PC with an Nvidia graphics card and at least 6GB of graphics VRAM you can try this installer for the Automatic1111 webUI implementation of Stable Diffusion. 

If you don't , you can try running the webUI on a cloud service. 

Running the webUI lets you load custom trained models/loras, merge models, do upscaling and interrogation, and a bunch of other tricks and techniques. You can also train your own if you can work out how to put together a dataset.

AI video generation is still in its infancy and I haven't played around with it, there is an extension for the webUI that will let you use a video for a controlnet input which gives you a few options - you can convert a video from one style to another, or use it for motion capture. But it's hard to get coherent results without "flicker" due to the randomness of AI artgen.