EraseChange Video Background is an iPhone app that allows you to change the background of your portrait videos in just a few taps. With advanced artificial intelligence algorithms, the app accurately and automatically segments the portrait from its background. You can mix your portrait video with other videos or pictures and create amazing selfie videos that transport you to fantasy worlds.

The app offers a VIP membership subscription that gives you access to HD output and new weekly updates. For $2.99 USD annually, you can use HD features and all available images and videos for the duration of the subscription. The subscription automatically renews for the same price and duration period unless auto-renew is turned off at least 24-hours before the end of the current period. Users can manage subscriptions and turn off auto-renewal via the iTunes Account Settings.

Overall, EraseChange Video Background is an excellent app for those looking to create unique and creative portrait videos with ease.