Fail to embed a video into marketing blocks

Following guidelines of the theme readme file I've tried to embed a youtube video into one of my marketing blocks. Effect - negative.

While editing the marketing block everything looks fine and the video plays nicely in preview. But on the front page the video just disappears; studying the html code of the front page I've found out the the <iframe> tag with all its content simply is not present. Probably it's excluded by a filter or due to some security reasons.

Could you check if it's a general issue of the theme or just my local predicament? If the latter what would you suggest to try to make this function work?

I mark this bug as a major because marketing blocks are presented as one of the key theme advantages so they require special attention.

Thanks.

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