You can access free footage from Pexels, Pixabay, Videezy, and Mixkit. I'm really sorry; sometimes I can’t share sample footage if it does not belong to me.
Maybe in the future, but for now, you can watch this video. It can help you because Premiere Pro and After Effects are quite similar. Benn TK Eye Transition - Premiere Pro Transition Tutorial ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-DazwTD8XNqE.html