I use this graphics card with DaVinci Resolve 16 from Blackmagic. CUDA and OpenCL are supported. Video editing with preview, e.g. editing and colour grading, runs smoothly. To what extent the GPU support is used for transcoding into the target format, e.g. MP4, is unfortunately not apparent. The video material is Full HD / 25p / Raw - i.e. 220 MBit/s bandwidth.
An older version of MAGIX video deluxe also works with regard to video editing with Full HD and MP4 video material, but the MP4 export does not run with CUDA support. By the way, I had the same problem with this software using a different graphics card.
I.e. the "normal" functionality of the graphics card is unrestrictedly suitable for video editing. The performance is rather determined by the other PC components CPU, RAM, disk. Whether the GPU support of the graphics card can be used for a performance boost depends more on the video software used.

What does beginner mean? If you really only want to do basics, i.e. snip around a bit, create nice effects, sound underpainting and the like, the card is suitable for that. 4k should also be possible. But of course it also depends on how much RAM you have installed. But the card should be completely sufficient for beginner basics. Your CPU/RAM (I assume) could be the bottleneck.