Is there any AI upscale tool for videos?
There's a few options I've seen listed at https://sites.google.com/view/aiupscalingtutorials/ai-upscaling:

1. ESRGAN

An open source AI upscaler (super sampler) based on a generative adversarial network architecture.
Can be run in CPU mode, but requires a CUDA enabled Nvidia graphics card to get the most out of it.

2. SFTGAN

An open source image enhancer that seeks to restore lost texture details from known types, made by the same team who developed ESRGAN.
Can be run in CPU mode, but requires a CUDA enabled Nvidia graphics card to get the most out of it.

3. Topaz Gigapixel AI / Video Enhance AI

Commercial super sampler that uses artificial intelligence and is made by Topaz Labs.  It costs $100, but comes with a 30 day free trial.
Produces good results with little fuss.  Easy to install, but also requires a CUDA enabled Nvidia graphics card.

4. Sharpen AI

Commercial image enhancer that uses artificial intelligence and is made by Topaz Labs.  It costs $80, but comes with a 30 day free trial.
The algorithm often compliments other super resolution results, effectively sharpening some blurriness and enhancing detail.

5. Nvidia Gameworks

Apparently, it works quite well, but it requires a beta access pass which very few people were awarded.


And then I've also read some good reports about the open-source Dandere2x which may be worth checking out.