Local video not working

[uitlegentekst]

Environment

**Flutter version:**1.18.0
Plugin version: 3.2.0
iOS version: 13.5
Xcode version: 11.5

First of all: thanks for your great plugin! Just one thing I can get my head around: I just can't get a local html-embedded video to work. Is this a bug or am I doing something wrong?

Description

Expected behavior:
Embedded video in html is displayed in the AppWebView

Current behavior:
Video is not loaded. Slash through play button.

Steps to reproduce

1. Make a simple html-file with embedded local-video (see below) and test.
2. Add files through Pubspec.yaml
3. Create AppWebView with controller and display html.

###Dart code:
I use this to create the AppWebView:

webView = InAppWebView(
onLoadStart: (InAppWebViewController controller, String url) {
print('load');
},
onLoadError: (InAppWebViewController controller, String url, int code,
String message) async {
print("error $url: $code, $message");
},
onLoadHttpError: (InAppWebViewController controller, String url,
int statusCode, String description) async {
print("HTTP error $url: $statusCode, $description");
},
onWebViewCreated: (InAppWebViewController controller) {
webViewController = controller;
},
initialUrl: "http://localhost:8080/assets/source/intro.html",
initialOptions: InAppWebViewGroupOptions(
crossPlatform: InAppWebViewOptions(
cacheEnabled: true,
javaScriptCanOpenWindowsAutomatically: true,
minimumFontSize: 10,
useOnLoadResource: true,
debuggingEnabled: true,
javaScriptEnabled: true,
mediaPlaybackRequiresUserGesture: false,
),
),
);

Ofcourse I add it to the tree. The WebView works great. Only video is not displayed.

###HTML code.
The videotag in HTML is:

Pubspec is attached.

I am at a loss here.. any ideas?

Regards,
Mark

pubspec.yaml.zip