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Generate oembed preview of the inserted link, for more details see Embeds in WordPress.
array(
'type' => 'oembed',
'value' => 'https://vimeo.com/113078377',
'label' => __('Label', '{domain}'),
'desc' => __('Description', '{domain}'),
'help' => __('Help tip', '{domain}'),
'preview' => array(
'width' => 300, // optional, if you want to set the fixed width to iframe
'height' => 300, // optional, if you want to set the fixed height to iframe
/**
* if is set to false it will force to fit the dimensions,
* because some widgets return iframe with aspect ratio and ignore applied dimensions
*/
'keep_ratio' => true
)
)