ZAO's workflow is quite simple: you take a selfie, which is used to change the face of an actor in a selection of well-known films and series. Your face even mimics the spirit of the original artist, though it sometimes looks like a frightening mask. As you can see in the tweet below, the results are still very effective for counting images within a few seconds for a freely available service.
If you want to try the app for yourself, you won't find it in the Play Store, as it is mainly sold in China. It's only available for sideloading through Huawei's App Gallery or Oppo and Vivo stores. However, with privacy issues in mind, you can prevent this from happening.