To add your Spotlightr video to Wix you must use the HTML element provided.
Wherever you want to add the video you need to add the "Embed HTML" element by browsing to Embed Code >> Popular Embeds >> Embed HTML as shown here:
In this example we are adding the element to the middle part of a new section. Once the element is added configure the settings and add your video embed code:
Then just drag the corners of the video to your desired size:
Here's how it looks on the page: