Please ensure you're using latest 2.0.3 nightly found below.
www.joomlapolis.com/downloads/doc_details/640-community-builder-nightly-build
Once up to date please confirm if issue persists. Please ensure your video is a valid format the field accepts and that the video is working fine.
We found an issue with the video html having the wrong closing tag and this could be a symptom of that, but I am unable to confirm your issue in latest internal build with an uploaded video or a youtube video. Do you have a link to the view you're attempting to upload or link to so I can test with an internal build?