Hi!
You can use wixData with Store databases. (Stores/Orders database).
Example:
Go to Orders database. You will see lineItems field in this field you can find mediaItems of every product for selected order:
lineItems[index].mediaItem.src;
this will give you the URL of image/video and you can use this. If you have videos in your products you can check type with if statement so make sure that you will get an image.
OR:
You can use productId (again in lineItems) and you can query the id for Products database and you can get any info of selected product/s.
OR:
You can create your own orders database and you can use onNewOrder or similar event API to insert customized item into your custom database. This is very useful but remember each time you make an update in your orders Orders database will be updated so you should also update your database too otherwise you might see old data for some orders.
When you code there is multiple ways to do something choose which is best for your project.