You can embed a Youtube video into your store. Here is a short tutorial about how to that.
1. Get the iframe script on Youtube – Share – Embed – Copy the script (ex. <iframe… /iframe>)
2. In the admin page on Shoptsie: Pages – Add page – Description Type (default) – Insert Video – Paste the script
3. You can set this page to be on the Homepage, above your products
4. Save 🙂
You can embed videos from Vimeo with the same steps.