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VideoBrush doesn't exist in WPF
WPF contains only 6 Brushes: 2 GradientBrushes (Linear- and RadialGradientBrush, both deriving from GradientBrush), 1 SolidColorBrush, and 3 Tilebrushes (DrawingBrush, ImageBrush and VisualBrush, all deriving from TileBrush), but there is no VideoBrush
there, as the Document says.
Thomas C. Huber