Use the WijVideo control to play videos in HTML5. Note that not all browsers currently support HTML5. Make sure that you are using a browser that does in order to view the video.
WijVideo Markup
The following markup creates the WijVideo control. Set the TargetControlID property to attach the extender to a control.
<cc1:WijVideo ID="Panel1_WijVideo" runat="server"
TargetControlID="Panel1">
</cc1:WijVideo>