Instagram is in full efforts to make its stories more of interactive sort which is the reason why it has introduced a polling feature so that users would be able to add poll sticker.
Poll option is just like any other stickers offered by Instagram. User has to drag and drop the sticker on his story and he would be given some options for customization with questions and some choices. People or friends viewing the story of a user would be able to use the given choices in order to vote after which the overall results would be shown.
To see detailed results, user has to go to viewers list for the provided image or video of the story and he will be displayed with the figures like total votes, who voted and what option they had chosen. This would help many commercial Instagram pages.