You can manually add a thumbnail with the shortcode by making use of the
poster
attribute.
If you want to do it automatically, then you have to implement FFMPEG
or LIBAV
first, meaning they would have to be available on your server. Afterwards you could hook into wp_generate_attachment_metadata
and automate process – I have given an answer how to do this for PDF’s some time ago, just so you get an idea. But that of course will be quite some work.
I hear there are some pretty good plug-ins in the WordPress Plugin Directory, although I haven’t used them myself.
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