Konveio doesn't offer video streaming but allows you to embed a video player from a site like Youtube or Vimeo. These sites all provide embed codes that you can plug into Konveio by clicking on the "Switch to plain text editor " link under the editor and then pasting the code.
Open the Embed shared link
Copy the embed code
Change to rich text editor > Paste into the Content Block of the Overview page > Change the width to 100% to fit the size of the block/screen.
Save and your video will play from the site.