PrestaShop 1.6.x. How to insert the iframe with the multimedia content into CMS pages

1. In your PrestaShop admin panel go to Preferences -> General section: 
2.  Set Allow iframes on HTML fields to Yes and Use HTMLPurifier Library to No: 
3. Click the Save button to confirm the action.
4. Go to Preferences -> CMS and click the Edit button on the page where you want to insert the iframe into a video: 
5. Click the Insert button and choose there Insert video tab: 
6. You can choose either to use General tab and upload the image or add the iframe code with video to Embed tab: 
7. To add the embed code from YouTube go to YouTube website and find the video you want.
8. Click Share button and choose the Embed tab. Copy the code and add to the Insert video popup into your CMS page: 
9. Click the Save button. Refresh your website to see the changes.

Hopefully, this tutorial was helpful for you.