Hi there – for live video streaming, we support the Ustream shortcode. You can learn more about it here:
https://en.support.wordpress.com/videos/ustream-tv/
Also just a heads-up that since your site has a Premium plan, you’re entitled to live-chat and email support, accessible here:
https://wordpress.com/help/contact
You’re welcome to still post in these forums, but those other support avenues may be faster, and you’ll always get a staff reply.