Using 'Headings 2' for titles/captions – negative effect on SEO? Alternatives?

Hello,

I’m using ‘Headings’ 1/2/3 on many of my pages – often simply for design purposes – to title a paragraph, a video or an image.

I’m worried this is going to interfere with SEO. For instance on a video page I may have 12 videos each with its own title in Heading 2. Is this confusing for robots and for SEO?

Thanks