@computo,
The account you provided do not have permission to change the settings in Global Configuration in back-end.
Please set Default Editor to “None” then go to the “appolio_Video_Bienvenida” module (Custom HTML module) and add the video code with format below:
<div class="video-shuffle-wrap">
<div class="video-shuffle" data-js-view="video-shuffle">
<div class="mask"> </div>
<video loop autoplay style="width: 100%; height: auto;" poster="/images/stories/joomla/poster.png">
<source src="your_video_link.mp4" type="video/mp4">
<object type="application/x-shockwave-flash" data="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf" width="100%" height="1011" >
<param name="movie" value="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf" />
<param name="allowFullScreen" value="true" />
<param name="wmode" value="transparent" />
<param name="flashVars" value="config={'playlist':['http%3A%2F%2F10.0.0.102%2Fja_works%2Fja_appolio%2Fimages%2Fstories%2Fjoomla%2Fposter.png',{'url':'http%3A%2F%2F10.0.0.102%2Fja_works%2Fja_appolio%2Fimages%2Fstories%2Fjoomla%2Fwelcome.mp4','autoPlay':true, 'controls': null}]}" />
<img alt="Sample Video" src="/http%3A%2F%2F10.0.0.102%2Fja_works%2Fja_appolio%2Fimages%2Fstories%2Fjoomla%2Fposter.png" width="100%" height="auto" title="No video playback capabilities, please download the video below" />
</object>
</video>
</div>
</div>
Replace with your own video path in red.
Also, please have a look at this guide for more information.