amfoto1 wrote:
Obviously... "Yes" is the answer to your question.
However, I didn't see anyone mention that a video frame capture will be a low resolution file. Depending upon what camera you're using, you can probably expect the file to be about 1/3 the size and resolution as a JPEG done with a still shot. Even 4K video is considerably lower resolution than still shots made with a DSLR. But, depending upon your purpose, it might be all you need.
Cameras that record "4K stills" yield 8.2944 MP images. Cameras that record "6K stills" record 18MP images. My old employer made over ten million school portraits with 5.2 to 8.2 MP cameras.
Chopping a frame out of an HD video yields a 1920x1080 pixel image (just over 2.07 MP). A frame chopped out of a 4K video is 3840x2160 pixels (Nearly 8.3 MP).
When I record 4K video, I often use single frames in PDF documents covering the same content as a training video.