How to get Zoom value in scroll viewer in C# wpf Kinect SDK 2.0?

Question

I have recently started using the Kinect SDK 2.0 and am focusing on a zoom and pan functionality, as in the Control Basics-WPF sample.

I have got the zoom and pan functionality up and running. The problem is that I wish to access the value of the amount of zoom which has been performed by the Pinch zoom gesture.

Here is my xaml:

    <UserControl x:Class="ImageNav.NavigationImage"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:k="http://schemas.microsoft.com/kinect/2014"
          mc:Ignorable="d"
          d:DesignWidth="1200"
          d:DesignHeight="700"
          >
    
        <Grid Grid.RowSpan="2">
            <ScrollViewer Name="scrollViewer" Grid.Row="0"
                          HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"
                          k:KinectRegion.IsHorizontalRailEnabled="true" k:KinectRegion.IsVerticalRailEnabled="true"
                          k:KinectRegion.ZoomMode="Enabled">
                <Image Name="navigationImage" RenderTransformOrigin="0.5, 0.5" />
            </ScrollViewer>
            <TextBox x:Name="ZoomTextBox" Grid.Row="1" TextWrapping="Wrap" Text="Zoom: 100%" IsEnabled="False" Panel.ZIndex="10" BorderThickness="0" HorizontalAlignment="Right" VerticalAlignment="Bottom" FontSize="20"/>
        </Grid>
    </UserControl>

I would have wanted there to be something like `k:KinectRegion.ZoomFactor`, but that isnt available. I've also tried to see what changes in the UI elements when I perform the zoom gesture, by writing the `Height` and `ActualHeight` properties of the `ScrollViewer scrollViewer` and `Image navigationImage` to a log file, but they show no change whatsoever.

When I perform the zoom gesture, I would like to get the value of zoom i.e. the current height and width of the image with respect to the original height and width.