Putting a video under product image or product description

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HI there,

I hope everyone is well. 

I have a problem how to input a video under a product image or product description. My current theme might not be able to do it as of this time and says I need to update my menu to be able to post 3D photos or video inside my store.  I've tried following the steps on how to insert codes using edit codes in product template liquid but not being an expert on anything about codes, I was reluctant to do it. 

Can anybody help me?