Linking someone else's instagram post & displaying it on my app as content

I NEED HELP! not an expert!
Hi, one of the benefits of using my fasting membership app is being able to view loads of content. This content comes directly from the app, and some of the content are other people’s instagrams posts.
But how do i do this? How do I take someones instagram video and post it in my app as content that my users can learn from??