The extract-still-from-video function allows you to take still thumbnails from a video.
extract-still-from-video tracks the movements in the video provided to find the thumbnail that summarizes the video best.
By default, extract-still-from-video returns the binary image data with the
Content-Type response header set to
extract-still-from-video is a synchronous Web function. This means that the response includes the ouput of the Web function.