Add Video property

metadata/admin/charcoal/property/video-property.json

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+{
+    "admin": {
+        "input_type": "charcoal/admin/property/input/video",
+        "display_type": "charcoal/admin/property/display/video"
+    }
+}

src/Charcoal/Property/VideoProperty.php

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+<?php
+
+namespace Charcoal\Property;
+
+// From 'charcoal-property'
+use Charcoal\Property\FileProperty;
+
+/**
+ * Video Property.
+ *
+ * The video property is a specialized file property that handles video file.
+ */
+class VideoProperty extends FileProperty
+{
+    /**
+     * @return string
+     */
+    public function type()
+    {
+        return 'video';
+    }
+
+    /**
+     * Retrieves the default list of acceptable MIME types for uploaded files.
+     *
+     * This method should be overriden.
+     *
+     * @return string[]
+     */
+    public function getDefaultAcceptedMimetypes()
+    {
+        return [
+            'video/mp4',
+            'video/webm',
+            'video/ogg',
+            'video/ogv',
+            'video/x-matroska',
+        ];
+    }
+
+    /**
+     * Resolve the file extension from the given MIME type.
+     *
+     * @param  string $type The MIME type to resolve.
+     * @return string|null The extension based on the MIME type.
+     */
+    protected function resolveExtensionFromMimeType($type)
+    {
+        switch ($type) {
+            case 'video/mp4':
+                return 'mp4';
+
+            case 'video/webm':
+                return 'webm';
+
+            case 'video/ogg':
+            case 'video/ogv':
+                return 'ogv';
+
+            case 'video/x-matroska':
+                return 'mkv';
+        }
+
+        return null;
+    }
+}