getPlugin(name) {
    const plugins = this.core.plugins.concat(this.core.activeContainer.plugins)
    return plugins.filter(plugin => plugin.name === name)[0]
  }
get a plugin by its name.
@method getPlugin
@param {String} name of the plugin.
@return {Object} the plugin instance
@example
```javascript
var poster = player.getPlugin('poster');
poster.hidePlayButton();
```