I have two special albums for video and audio files. I can edit files in my admin panel. But guests may play video and audio in Jplayer only. They can't download video audio files like pictures.
Is it possible to make it possible? There are some plugins or way to make it?

That's actually quite simple as multimedia files are just "images" as well. On the image.php of the theme used you would have to add something like this to get the full image/file link:
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Download

Depending on the theme you of course need to adjust the enclosingphp` wrappers.

Thank you. I fix it!