Can video playing on-screen be captured using a graphics card?

[gddpb]

My PC uses the NVIDIA GeForce RTX 2060 graphics card, which can grab and record on-screen video... from games only it claims.
I'm not into gaming, but do watch videos offered online by television stations.
Some can be recorded using software tools such as youtube-dl or ffmpeg, but others can only be watched and not recorded.
Can this graphics hardware somehow be used to record anything appearing on-screen? If so, where can I find more about this?

[DB83]

The blurb for this card states 'Game and Stream simultaneously'


To stream you still require software such as OBS and I believe that software will act as a screen-capture program which is all you need when standard downloading is not possible.

[Eric-jan]

The screen recorders i used use a low frame rate, is there some secret to avoid this ?
btw, the ones that can be recorded, these streams are directly recorded/downloaded via their url and are no problem.