DanCoulter

Once this plugin is activated, you’ll be able to use the new “shortcodes” 
in your sidebar text widget. The shortcodes will work exactly the same 
way as they do in your posts.

Sidebar Shortcodes

Allows shortcodes to be used in the sidebar text widget.

Gary Jones

Daisy Olsen

CharlesClarkson

This plugin will allow you to use the <code>[embed]</code> shortcode and plain text URLs to automatically embed videos and other oembed supported media into text widgets.
More information on oEmbed the <code>[embed]</code> shortcode and a list of supported sites can be found <a href="https://codex.wordpress.org/Embeds" rel="nofollow ugc">here</a>.
This plugin has no configuration screen or settings.

Text Widget oEmbed

Allows oEmbed and the [embed] shortcode to be used in sidebar text widgets.

Sidebar Shortcodes vs Text Widget oEmbed