MainWindow.xaml

<Window x:Class="MiniaturaVideo.MainWindow"
        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"
        xmlns:local="clr-namespace:MiniaturaVideo"
        mc:Ignorable="d"
        Title="Miniatura de Vídeo" Width="610" Height="730">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Button Name="AbrirVideoButton" Content=" Abrir vídeo... " Click="AbrirVideoButton_Click"  Margin="10" />
        <Border Name="MidiaPlayerBorder" Grid.Row="1" HorizontalAlignment="Center" Width="576" Height="324"/>
        <Button Name="PausarVideoButton" Content=" Pausar " Grid.Row="2" Click="PausarVideoButton_Click" Margin="10,0" />
        <TextBlock Name="InfosMidiaTextBlock" Grid.Row="3" HorizontalAlignment="Center" Margin="10" />
        <Button Name="ObterMiniaturaButton" Content=" Obter Miniatura " Grid.Row="4" Click="ObterMiniaturaButton_Click" IsEnabled="False" Margin="10" />
        <Grid Width="194" Height="110" Grid.Row="5" Margin="10">
            <Border Background="Green" BorderBrush="Red" BorderThickness="1" Width="194" Height="110" />
            <Image Name="MiniaturaImage" Stretch="None" Width="192" Height="108" />
        </Grid>
        <TextBlock Grid.Row="6" Margin="10,0">
            Criado por Marcio Maciel<LineBreak/>
            - https://www.linkedin.com/in/marcioqmaciel/<LineBreak />
            - https://www.facebook.com/marcioqmaciel<LineBreak />
            - https://twitter.com/marcioQmaciel
        </TextBlock>
    </Grid>
</Window>