You can use Simulink Support Package for Android Devices to convert a Simulink Model to Android Application. You can embed your MATLAB code in MATLAB function block and use this with other Android Blocks and create Android Applications with one Click.
To get camera frames use Android Camera Block and to display it on Phone screen, use Android Video Display Block. Connect camera Block output with input of MATLAB function block and input of Video Display block with output of MATLAB function block.
You can refer to the following example which uses MATLAB function block https://www.mathworks.com/help/supportpkg/android/examples/control-lego-mindstorms-ev3-robot-using-android-device.html
You can refer to the following example to get camera frames and display https://www.mathworks.com/help/supportpkg/android/examples/color-replacement.html
