Get absolute position of an image control with mvvm

Question

Hi, I have a question of getting the absolute position of an image control in view model by using MVVM?

The XAML is as follow

<Window x:Class="View.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
        Title="MainWindow" Height="600" Width="800">
    <Grid>
        <DockPanel HorizontalAlignment="Stretch" LastChildFill="True" VerticalAlignment="Stretch">
            <Label DockPanel.Dock="Bottom" Content="Label" Height="35" VerticalAlignment="Bottom" FontSize="20" Background="#FF020202" FontFamily="Microsoft Sans Serif" Foreground="#FFFBF8F8"/>
            <Grid DockPanel.Dock="Left" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >
                <Viewbox Stretch="Uniform">
                    <Image Name="image" Width="513" Height="424" />
                </Viewbox>
                <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ShowGridLines="True">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="1*"/>
                        <RowDefinition Height="3*"/>
                        <RowDefinition Height="1*"/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="1*"/>
                        <ColumnDefinition Width="3*"/>
                        <ColumnDefinition Width="1*"/>
                    </Grid.ColumnDefinitions>
                    <Grid Grid.Column="1" Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ShowGridLines="True">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="1*"/>
                            <RowDefinition Height="1*"/>
                            <RowDefinition Height="1*"/>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="1*"/>
                            <ColumnDefinition Width="2*"/>
                            <ColumnDefinition Width="1*"/>
                            <ColumnDefinition Width="2*"/>
                            <ColumnDefinition Width="1*"/>
                        </Grid.ColumnDefinitions>
                        <Viewbox Grid.Column="1" Grid.Row="1" Stretch="Uniform">
                            <Image VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Height="473" Width="476" Source="pack://siteoforigin:,,,/Resources/startButton.png">
                                <i:Interaction.Triggers>
                                    <i:EventTrigger EventName="MouseEnter">
                                        <i:InvokeCommandAction Command="{Binding _startButtonMouseOverCommand}"/>
                                    </i:EventTrigger>
                                </i:Interaction.Triggers>
                            </Image>
                        </Viewbox>
                        <Viewbox Grid.Column="3" Grid.Row="1" Stretch="Uniform">
                            <Image VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Height="473" Width="476" Source="pack://siteoforigin:,,,/Resources/StopButton.png"/>
                        </Viewbox>
                    </Grid>
                </Grid>
            </Grid>
            <Grid DockPanel.Dock="Right" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Black"/>
        </DockPanel>
    </Grid>
</Window>

Thank you.