Do I need to warn users if I collect anonymous data?

I wanted to build a Tinder-style job portfolio website where it would present my accomplishments one by one to recruiters in the form of a Tinder swipe card. The way I want the order of the Tinder cards to show up would be based on data collected from the users as they swipe left or right (dislike/like). Am I allowed to collect this user data without having a cookie warning or something similar show up when they load the page?