I want to add some content after video setting options in template 'wysiwyg.widgets.video', then I write the code in my custom module:

<t t-inherit="wysiwyg.widgets.video" t-inherit-mode="extension">
    <xpath expr="//*[hasclass('o_video_dialog_options')]" position="after"> 
            <div id="videoDragDrop">some content</div>
    </xpath>
</t>

but it throw an error says that module "wysiwyg" not found, then i change the code to:
<t t-inherit="web_editor.wysiwyg.widgets.video" t-inherit-mode="extension">
    <xpath expr="//*[hasclass('o_video_dialog_options')]" position="after"> 
            <div id="videoDragDrop">some content</div>
    </xpath>
</t>

after update module, there no error, but it doesn't appear, how can i make it work?