У вашего броузера проблема в совместимости с HTML5
In this short video I will show you how to video capture using VLC, v 2.0.0. With a screen capture filter called" Media Looks" and a freeware filter called "UScreen" is also available. You can download them both from free-codecs.com.
www.free-codecs.com/download/medialooks_screen_capture_directShow_filter.htm
http://www.free-codecs.com/download/UScreenCapture_DirectShow_Filter.htm