To use the Video Widget to embed a video into a Vision Event, you first need to find the Video URL or Video ID.
To find the Video URL, simply visit the video online, copy the URL within the address bar of your browser, and paste this within the Video ID box of the Video Widget. When you paste in the Video URL to the widget, it will automatically shorten to the Video ID.
To find the Video ID, look at the Video URL and part of it will be the Video ID. Highlighted below are examples of where to find the Video ID on various video hosting sites.
YouTube 
Vimeo 
Vine 
Daily Motion 