Currently it is not possible to embed videos within your screens. If you'd like to request this feature or submit additional feedback, we want to make sure your voice is heard, so please contact InVision Support.
As an alternative to embedding a video, you can upload a static image from your video and create a hotspot that links to the externally hosted video file. That way, when a user activates the hotspot, a new browser tab will open with that video link.
You can also upload an animated GIF displaying your video content. To learn more, check out this article: How can I use GIFs for custom interactions?