I'm not sure that a 100mb video is the best thing to have as a website background for visitors... your best bet may be to upload it to youtube with a click-to-play set up.
Well it looks like you have the domain name set up correctly. It looks like your WordPress configuration file is a bit wonky though. So, if you've bought the domain name since setting up WordPress you'll need to modify wp-config.php like this https://codex.wordpress.org/Changing_The_Site_URL...
Buy a domain name and you can register it directly setting the correct DNS records, they have comprehensive help guides/tutorials. I've been with them since 2010 (here since 2007...wow 10 years) and it's been flawless.
Seems to be working alright here, not sure what to suggest apart from reporting if it happens again. Could have been a temporary problem that's been resolved.
Awesome Design
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