VideoRecorder.swf is embedded above, the size is 1284x756 but the recording it will produce is 1280x720.
For installation instructions check out http://hdfvr.com/documentation#1.
How it works:
This HTML file contains the JS API, If you click View Source you will see it.
This article explains where you will find the new recordings.
For personalized support go to your client area on http://avchathq.com and submit a Support Ticket.
An official forum with plenty of info is also available at http://avchathq.com/forum/.