How to insert videos into WordPress Widget

WonderPlugin Video Embed is an easy and powerful way to add videos to your WordPress. You can embed your video to the sidebar widget, WordPress posts and pages. It supports YouTube, Vimeo, Wistia and self-hosted MP4/WebM videos. The video player is fully responsive and works on iPhone, iPad, Android, Chrome, Firefox, Safari, Opera, Internet Explorer 8/9/10/11 and Microsoft Edge.

source