Add thumbnail as a cover on mp4 files

[TofPlay]

Hi
With the url http://img.youtube.com/vi/<youtube-video-id>/maxresdefault.jpg is possible to download the thumbnail of youtube video and to add this file as a cover to the mp4 we can use this command line:

ffmpeg -i "<youtube file name>.mp4" -i "maxresdefault.jpg" -map 1 -map 0 -metadata title="<youtube title>" -codec copy -disposition:0 attached_pic "<new youtube file name with thumbnail as a cover>.mp4"

Is it possible to do the same on clipgrab?