<Grid 
    xmlns="http://schemas.microsoft.com/client/2007" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Background="Black" 
    HorizontalAlignment="Stretch" 
    VerticalAlignment="Stretch" 
    x:Name="videoArea">
    <MediaElement 
        x:Name="media" 
        HorizontalAlignment="Stretch" 
        VerticalAlignment="Stretch" />
</Grid>

