VideoDetailPage.xaml

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:videoPlayer="clr-namespace:Octane.Xamarin.Forms.VideoPlayer;assembly=clr-namespace:Octane.Xamarin.Forms.VideoPlayer;assembly=Octane.Xamarin.Forms.VideoPlayer"
             x:Class="CustomMediaGallery.VideoDetailPage">
    <ContentPage.Content>
        <StackLayout VerticalOptions="FillAndExpand"
                     HorizontalOptions="FillAndExpand"
                     Spacing="0">
           <videoPlayer:VideoPlayer x:Name="videoPlayer"  AutoPlay="True" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>