Source option provides formatted HTML Video element, with predefined source elements (that's where the name comes from) in WEBM, MP4 and OGV video format (URL-based API will create on-the-fly these specific versions of video if needed).
Find the Insert source shortcut below the title of your file and click it. Your file is now embedded onto your page/post.
Alternatively, you can select more options, and then select Embed/Player codes
Click the Copy source button and exit Publitio plugin
Paste the code onto your page.