On the presentation page, I tried to embed a youtube playlist, after saving the code gets deleted, all texts and html other code remains but the embed code is removed,
check the frontpage, and you will see text and pictures only, the youtubes do not show!
The text areas support shortcodes, so you will need to use shortcode plugins to embed videos there.
These fields all get sanitized on save using WordPress’ functions so any advanced HTML or scripts will be filtered out.