App that adds a field to the product creation page

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Hi, I'm having issues as to how i'm supposed to implement an app, which adds an additional field to the product create/edit page and then use the data from the field.

I want to add an additional field, similar to the 'Embed Youtube video' found in the 'Media' section under the 'Add media from URL' dropdown menu which is in the top right corner of the section. I want to use the data from the field to create an iframe on the products view page, regardless of the current theme. So far i haven't managed to find a way to extend the product create/edit page, without going to the current working theme's files and modifying the fields from there.