VideoBrush and MediaElement
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Grid x:Name="LayoutRoot" Background="White">
<MediaElement x:Name="BearVideo"
Source="Bear.wmv"
Opacity="0.5"
IsMuted="False" />
<StackPanel>
<Path>
<Path.Fill>
<VideoBrush SourceName="BearVideo" Stretch="UniformToFill" />
</Path.Fill>
<Path.Data>
<EllipseGeometry Center="100,100"
RadiusX="50"
RadiusY="50" />
</Path.Data>
</Path>
<TextBlock Text="Silverlight Rocks"
FontSize="30">
<TextBlock.Foreground>
<VideoBrush SourceName="BearVideo" Stretch="UniformToFill" />
</TextBlock.Foreground>
</TextBlock>
</StackPanel>
</Grid>
</UserControl>
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