See updated Docs here : http://themenectar.com/docs/salient/page-builder-row/#video-background .
If you can't get your video backgrounds to load make sure you've covered these two
items before panicking:
1. Ensure that your server is capable of parsing video files. Some servers require
you to add the media types supported in the .htaccess file in order for them to parse
the files. Open up your .htaccess file located in the root of your WordPress install and
add this in:
AddType video/mp4 .mp4
AddType video/mp4 .m4v
AddType video/ogg .ogv
AddType video/webm .webm
AddType video/webm .webmv
2. Ensure that your videos are correctly encoded for web playback. If you've added
the media types to your server and are still running into difficulty, please run your
videos through these converters:
http://video.online-convert.com/convert-to-mp4
http://video.online-convert.com/convert-to-webm