Camera Video Recording (#583)

* Fix Expander docs for 1567

* Camera Video Recording

* Update docs/maui/views/camera-view.md

Co-authored-by: Brandon Minnick <13558917+TheCodeTraveler@users.noreply.github.com>

* Update camera-view.md

---------

Co-authored-by: Gerald Versluis <gerald.versluis@microsoft.com>
Co-authored-by: Brandon Minnick <13558917+TheCodeTraveler@users.noreply.github.com>

Author: 3 people

docs/maui/views/camera-view.md

@@ -80,6 +80,9 @@ This should be added inside the `<dict>` element. Below shows a more complete ex
 
     <key>NSCameraUsageDescription</key>
     <string>PROVIDE YOUR REASON HERE</string>
+
+    <key>NSMicrophoneUsageDescription</key>
+    <string>PROVIDE YOUR REASON HERE</string>
 </dict>
 </plist>
 ```
@@ -127,10 +130,15 @@ This should be added inside the `<dict>` element. Below shows a more complete ex
 
     <key>NSCameraUsageDescription</key>
     <string>PROVIDE YOUR REASON HERE</string>
+
+    <key>NSMicrophoneUsageDescription</key>
+    <string>PROVIDE YOUR REASON HERE</string>
 </dict>
 </plist>
 ```
 
+More details can be found here: https://developer.apple.com/documentation/avfoundation/requesting-authorization-to-capture-and-save-media
+
 ### [Windows](#tab/windows)
 
 No setup is required.
@@ -422,6 +430,103 @@ async void HandleCaptureButtonTapped(object? sender, EventArgs e)
 }
 ```
 
+
+## Video Recording
+
+The `CameraView` provides the ability to record videos. This is possible through both the `StartVideoRecording` method or the `StartVideoRecordingCommand`.
+
+The following example shows how to add a `Button` into the application and setup the following bindings:
+
+- Bind the `Command` property of the `Button` to the `StartVideoRecordingCommand` property on the `CameraView`.
+
+```xaml
+<ContentPage
+    x:Class="CommunityToolkit.Maui.Sample.Pages.CameraViewPage"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit">
+    
+    <Grid ColumnDefinitions="*,*,*" RowDefinitions="*,30,30">
+        <toolkit:CameraView
+            x:Name="Camera" 
+            Grid.ColumnSpan="3" 
+            Grid.Row="0"
+            SelectedCamera="{Binding SelectedCamera}"
+            ZoomFactor="{Binding CurrentZoom}"
+            CameraFlashMode="{Binding FlashMode}" />
+
+        <Slider 
+            Grid.Column="0"
+            Grid.Row="1"
+            Value="{Binding CurrentZoom}"
+            Maximum="{Binding SelectedCamera.MaximumZoomFactor, FallbackValue=1}"
+            Minimum="{Binding SelectedCamera.MinimumZoomFactor, FallbackValue=1}"/>
+
+        <Picker 
+            Grid.Column="1"
+            Grid.Row="1"
+            Title="Flash"
+            IsVisible="{Binding Path=SelectedCamera.IsFlashSupported, FallbackValue=false}"
+            ItemsSource="{Binding FlashModes}"
+            SelectedItem="{Binding FlashMode}" />
+
+        <Picker 
+            Grid.Column="2"
+            Grid.Row="1"
+            Title="Available Resolutions"
+            ItemsSource="{Binding SelectedCamera.SupportedResolutions}"
+            SelectedItem="{Binding SelectedResolution}" />
+
+        <Button Clicked="StartCameraRecording"
+                Text="StartVideoRecording" />
+
+        <Button Command="{Binding StartVideoRecordingCommand, Source={x:Reference Camera}, x:DataType=toolkit:CameraView}"
+                CommandParameter="{Binding Stream}"
+                Text="StartVideoRecording" />
+
+        <Button Command="{Binding StopVideoRecordingCommand, Source={x:Reference Camera}, x:DataType=toolkit:CameraView}"
+                CommandParameter="{Binding Token}"
+                Text="StopVideoRecording" />
+    </Grid>
+
+</ContentPage>
+```
+
+> [!NOTE]
+> You must provide a clean stream in order to record the video.
+
+The following example demonstrates how to use the `StartVideoRecording` method:
+
+> [!NOTE]
+> The C# code below uses the Camera field defined above in XAML (`<toolkit:CameraView x:Name="Camera" />`)
+
+```cs
+async void StartCameraRecordingWithCustomStream(object? sender, EventArgs e)
+{
+    using var threeSecondVideoRecordingStream = new FileStream("recording.mp4");
+    await Camera.StartVideoRecording(stream, CancellationToken.None);
+
+    await Task.Delay(TimeSpan.FromSeconds(3));
+    
+    await Camera.StopVideoRecording(CancellationToken.None);
+    await FileSaver.SaveAsync("recording.mp4", threeSecondVideoRecordingStream);
+}
+```
+
+In case you want to record a short video and record video in `MemoryStream` you can use the next overload of VideoRecording:
+
+```cs
+async void StartCameraRecording(object? sender, EventArgs e)
+{
+    await Camera.StartVideoRecording(CancellationToken.None);
+    
+    await Task.Delay(TimeSpan.FromSeconds(3));
+    
+    var threeSecondVideoRecordingStream = await Camera.StopVideoRecording(CancellationToken.None);
+    await FileSaver.SaveAsync("recording.mp4", threeSecondVideoRecordingStream);
+}
+```
+
 ## Start preview
 
 The `CameraView` provides the ability to programmatically start the preview from the camera. This is possible through both the `StartCameraPreview` method or the `StartCameraPreviewCommand`.