OpenCamera.kt

    private fun openCameraFront(width: Int, height: Int) {
        setUpCameraOutputsFront(width, height)
        configureTransformFront(width, height)
        val manager = activity?.getSystemService(Context.CAMERA_SERVICE) as CameraManager
        try {
            manager.openCamera(cameraIdFront, stateCallbackFront, backgroundHandler)
        } catch (e: CameraAccessException) {
            Log.e(TAG, e.toString())
        } 
    }

    private fun openCameraRear(width: Int, height: Int) {
        setUpCameraOutputsRear(width, height)
        configureTransformRear(width, height)
        val manager = activity?.getSystemService(Context.CAMERA_SERVICE) as CameraManager
        try {
            manager.openCamera(cameraIdRear, stateCallbackRear, backgroundHandler)
        } catch (e: CameraAccessException) {
            Log.e(TAG, e.toString())
        }
    }