Once activated the plugin clear cache oembed and replace markup for oembed video, it adds a little bit of CSS to do the responsive part.
It uses the oembed WordPress so it will work only with
official providers (videos)
Features
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- Upload plugin files to the /wp-content/plugins/ directory
- Activate the plugin through the Plugins menu in WordPress
- Then go to settings > JM Twitter Cards to configure the plugin
- To display the metabox in edit section (posts, pages, attachments), enable option in section called Custom Twitter Cards
Meant to help developers only. You'll have to code to use them.