Yes — you can extract a still frame directly from the video file, which preserves the frame at the video’s native resolution. That is different from taking a normal screen capture of your display.

Two simple options mentioned:

• VLC: pause on the frame you want, step frame-by-frame if needed, and use VLC’s snapshot function.
• ffmpeg: extract a frame directly with a command such as: ffmpeg -ss 00:01:04 -i input.mp4 -frames:v 1 screenshot.png

This will save one frame from the chosen timestamp.

Keep in mind that the extracted image can only be as detailed as the video frame itself. If the video was recorded at a lower resolution than your still photos, it may still look less sharp than a dedicated photo.

On copyright: if you created the video yourself, the extracted frame is generally your work too, so using that frame is effectively using your own image from your own recording.