You can insert youtube video into your catalog pages or product description following steps below.
1. Copy youtube video link (e.g. https://www.youtube.com/watch?v=Iho3EUteXuA)
2. Paste this link into text editor window (e.g. catalog text element or product rich text field) selecting video button.
3. Showroom can display video if this product field is displayed in showroom template.
4. PDF catalog format will not show video, therefore we recommend to put another element behind (that is hidden in online catalog). This element will be displayed in PDF as front video will be not shown.