Hello Stephanus,
You can add video background to your site in the following way. You can add it using revolution slider with full control over it. and you can also add video background like the link you shared in your second video using a short code on a fullwidth template. If you want to add video background like on our demo page then you can use this short code on you home page and you can edit the source of the video to your own video. You can place this code on top of all code using classic editor. Here is the code:
COPY CODE
[vc_row inner_container="yes" section_type="main" type="video" bg_position="top" bg_position_horizontal="left" bg_repeat="no-repeat" bg_cover="true" bg_attachment="false" parallax_speed="0.5" min_height="0" border="none" css_animation="right-to-left" bg_video_src_webm="http://seventhqueen.com/themes/kleo/wp-content/uploads/2014/09/video_street.webm" padding_top="0" padding_bottom="0" text_color="#ffffff" bg_video_src_mp4="http://seventhqueen.com/themes/kleo/wp-content/uploads/2014/09/video_street.mp4" bg_image="3214" bg_video_src_ogv="http://seventhqueen.com/themes/kleo/wp-content/uploads/2014/09/video_street.ogg" bg_video_cover="3203"][vc_column width="1/1"][kleo_gap size="200px"][kleo_gap size="30px"][vc_column_text css_animation="right-to-left"]
you can see the attachment file to see which code should be changed.
You can also embed youtube video like this if you want. If you have any question then you can ask me. Thanks.
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