add dependency on video_thumbnail

pubspec.lock

@@ -1091,6 +1091,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  video_thumbnail:
+    dependency: "direct main"
+    description:
+      name: video_thumbnail
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.4.3"
   visibility_detector:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -98,6 +98,7 @@ dependencies:
   url_launcher: ^6.0.3
   uuid: ^3.0.4
   video_player: ^2.0.0
+  video_thumbnail: ^0.4.3
   visibility_detector: ^0.2.0
   wallpaper_manager_flutter: ^0.0.2