The drawn animation video is created in the DOINK animation app. To time it to the pre-recorded green screen video, I had to plan the way they interacted ahead of time. I used a screenshot of the video (left) imported into DOINK while composing the fairy animation. then I deleted the photo and replaced it with a solid color field that I would "erase" with the chroma filter in the new app. This took a bit of thinking, but it's certainly is worth it!