Vlc browser plugin (npapi-vlc) does not load in Qt Webkit browser

[fanoI]

I'm having problem to make the browser load the vlc plugin I've an html page that has this code inside:

<OBJECT type="applications/x-vlc-plugin" classid="clsid:9BE31822-FDAD-461B-AD51-BE1D1C159921"
 
codebase="http://downloads.videolan.org/pub/videolan/vlc/latest/win32/axvlc.cab#Version=0,8,6,0"
        width="640"
        height="480"
        id="vlc"
        version="VideoLAN.VLCPlugin.2">
<param name="MRL" id="mrlid" value="rtsp://***********" />
<param name="ShowDisplay" value="True" />
<param name="AutoLoop" value="False" />
<param name="AutoPlay" value="False" />
<param name="Volume" value="50" />
<param name="StartTime" value="0" />
<EMBED pluginspage="http://www.videolan.org" type="application/x-vlc-plugin" progid="VideoLAN.VLCPlugin.2" width="640" height="480" name="vlce"></EMBED>
</OBJECT>

<OBJECT type="applications/x-vlc-plugin" classid="clsid:9BE31822-FDAD-461B-AD51-BE1D1C159921"

codebase="http://downloads.videolan.org/pub/videolan/vlc/latest/win32/axvlc.cab#Version=0,8,6,0"
        width="640"
        height="480"
        id="vlc"
        version="VideoLAN.VLCPlugin.2">
<param name="MRL" id="mrlid" value="rtsp://***********" />
<param name="ShowDisplay" value="True" />
<param name="AutoLoop" value="False" />
<param name="AutoPlay" value="False" />
<param name="Volume" value="50" />
<param name="StartTime" value="0" />
<EMBED pluginspage="http://www.videolan.org" type="application/x-vlc-plugin" progid="VideoLAN.VLCPlugin.2" width="640" height="480" name="vlce"></EMBED>
</OBJECT>

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Instead of a movie I simply obtain a weird blue cube with '?' inside... no error, no debug anything...

I think to have enabled plugins in all possibles ways:

I've added in the QApplication ctor this code:

QWebSettings *settings = QWebSettings::globalSettings();
    settings->setAttribute(QWebSettings::JavascriptEnabled, true);
    settings->setAttribute(QWebSettings::PluginsEnabled, true);

QWebSettings *settings = QWebSettings::globalSettings();
    settings->setAttribute(QWebSettings::JavascriptEnabled, true);
    settings->setAttribute(QWebSettings::PluginsEnabled, true);

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I've done this in any QWebView that is created too...

Another thing I've tried is to force Qt to search plugins where npapi-vlc is installed doing in this way:

QCoreApplication::addLibraryPath("/usr/lib64/mozilla/plugins/");

QCoreApplication::addLibraryPath("/usr/lib64/mozilla/plugins/");

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and I continue to get a cube instead of a movie

What is the trick? There is some strange file to edit in some weird place to enable / disable some security that is blocking it?

The version of Qt I'm using is 5.6.1-3.

Please help me.

Thank you!

[ChrisW67]

I am not sure that it is reasonable to expect an ActiveX component, i.e. developed for Windows and very dependent on things like the registry, to work in a Linux/UNIX environment.