Apple has specifically disabled every method and workaround to autoplay video on iPads and iPhones (the "autoplay" attribute, and Javascript solutions like triggering hidden link's "onclick" event).
I have yet to find a way to autoplay on iPads and it looks like Apple is continuing to squash all efforts to do it. They state, "In Safari on iPhone OS (for all devices, including iPad), where the user may be on a cellular network and be charged per data unit, autobuffering and autoplay are disabled. No data is loaded until the user initiates it."
As a quick update I just checked out Filmon.com and the videos there no longer seem to be autoplaying on an iPad. Example: http://demand.filmon.com/distant-roads-173-cnd-ontario-ca-1 autoplays on Chrome, but not on the iPad.