QCameraImageProcessingControl

I have just found this (QCameraImageProcessingControl )class and I understand you can use it to control QCamera processes such as Contrast and Brightness Adjustment (etc). I have created an instance of QCamera and its working well but I cant figure out how to implement this class with my QCamera object:

Code:

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camera = new QCamera(this);
viewfinder = new QCameraViewfinder(this);
imageCapure = new QCameraImageCapture(camera, this);
 
layout = new QVBoxLayout;
camera->setViewfinder(viewfinder);
layout->addWidget(viewfinder);

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Can someone point me to the right direction? I would like to use 2 QSliders to adjust both brightness and contrast. Thank you in advance