SUMMARY
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STEPS TO REPRODUCE
1. install Kubuntu-Restricted-Extras
2. 
3. 

OBSERVED RESULT
Video acceleration on Vivaldi/Blink/Chromium browsers that was not working before starts working

EXPECTED RESULT
"Hope".

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: ALL
(available in About System)
KDE Plasma Version: ALL
KDE Frameworks Version: ALL 
Qt Version: ALL

ADDITIONAL INFORMATION
I had this problem for years. Hardware video acceleration never worked for me with Vivaldi, and I suppose other blink/Chromium based browser. It works with Firefox and I was using it only to watch videos, but them I came across other problem while trying to watch movies from an online festival. Maybe DRM prevents me from watching the movies on Linux and while I was asking around someone recommended me installing Kubuntu-Restricted-Extras. Immediately I realized that maybe this could solve my problem on Vivaldi and I was right. I installed this package and it made video acceleration work.

Why is that?
Like I said I tried for years to solve this, I changed everything and tried installing everything, of course, except this, and nothing worked.
What is different from the Kubuntu and Ubuntu versions of restricted-extras package? If the Kubuntu version is necessary for video acceleration to work than I imagine that this package should be included with Neon, and that's what I'm asking. Start shipping the NEON ISO with this package to make video acceleration work out of the box.

(doesn't hurt asking, but why on Vivaldi the Intel_GPU_Top shows activity on "VideoEnhance"? What is being "enhanced"? Maybe it's related to why "Render/3D" activity is double that of Firefox)