Responsive Video (Projekktor Core)

Hey there,
Posted a question a few days back, but does not seem to appear so am trying again;
Am using your plugin for wordpress, however;

The video gets cut in half when resizing browser or opening the page on smartphones.

Example here;
vodkova/wordpress/?p=517

Have tried playing around with the CSS; media queries etc. but I can't seem to fix the issue.
Am trying to go live in a few days and would love to keep your plugin, so any help would be appreciated.
Many thanks!
Best