When you run sweepstakes on Instagram, you should keep in mind the social network's regulations regarding sweepstakes and promotions.
Regarding IGTV posts, the Instagram API does not show us to external apps IGTV information. So you will not be able to create and collect information about an IGTV post.
On the other hand, it is possible to run sweepstakes on a post in your feed. If you want to select the winner of an Instagram sweepstake, among the users who have interacted with the publication (comments, mentions...), use our Instagram Sweepstakes app.
You can follow the steps we show you in the tutorial: How to Create a Direct Sweepstake on Instagram and Choose Winners >>