Video to product place

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Dear Shopify community!

I'm looking for a way to add product videos to my photo gallery on each product page:

I've tried searching for answers in here, but nothing seems to help me. I found one who said you just need to add a code, but I can't seem to figure out where to place the code in order to make it a part of the gallery.

Can someone please help me? My theme is Prestige.