4K Video Upscaling: What is it, How to do it, and it is worth upscaling?

We now have 4K videos on YouTube, Netflix, Blu-ray, etc., and we can record 4K videos with our phones, GoPros, and other cameras. Also, we have 4K smart TVs to watch those videos in a great watching experience. However, we still have old recordings or movies that are low in resolution. And, we must suffer watching them on 4K TVs due to the horrible quality.

The good news is, with the help of AI, we can do 4K Video upscaling and easily upscale low-resolution videos to 4K with almost the same watching experience as the native 4K videos.