a) Placeholder with link to Youtube
b) AV-Portal player embedded
<iframe width="560" height="315" scrolling="no" src="//av.tib.eu/player/40456" frameborder="0" allowfullscreen="allowfullscreen"></iframe>c) Youtube embedded
<iframe width="420" height="315" src="https://www.youtube.com/embed/fbZOii_l7M4" allowfullscreen="allowfullscreen"> </iframe>