Substract real-time image from Android camera and image from Android camera captured after 100ms in Simulink.

Hello! I make Android App where I need to substract 2 consecutive images with time step 100ms. I capture video with Android Camera block, so now main problem is to extract frame from video stream. There are plenty of examples how to extract frames from stored video or from webcamera, but it does not work with Android Camera. I have attached Simulink model of my app.

Are there any ideas how to extract frame from Android video stream?