Hi Tobiasz
I am Dave, an Independent Advisor, I will help you with this . . .
This is usually caused by a setting in the browser, rather than the graphics card device driver . . ..
In your browser, click the 3 dots at the top right, and open Settings from there
In the search box in the browser settings, search for hardware
Disable 'Hardware graphics acceleration'
Then restart your browser, and test to see if you can watch online videos . . .