1. Check this post on Custom IPS rule for blocking port 443.
https://www-secure.symantec.com/connect/forums/custom-intrusion-prevention-rule-quick-question
How to block all website and allow only certain websites using Network Threat Protection Firewall rule.
http://www.symantec.com/business/support/index?page=content&id=TECH95248&locale=en_US
2. Use Application and Device Control (on 32bit clients) to block the video applications from running.
http://www.symantec.com/business/security_response/securityupdates/list.jsp?fid=adc
This is the wrong forum, I will move this over to the Endpoint Protection forum for you.
Best,
Thomas