Added an example which you should be able to run from the addons/ofxControlPanel/example folder showing how the parameter stuff works.
The easiest usage is to create ofParameterGroups for a set of ofParameters and then add the group to the control panel. You can also add individual parameters though instead.
Quick example:
ofParameterGroup cvControls; //this will be in your header file
ofParameter <bool> bInvert;
ofParemeter <float> threshold;
//then in setup
cvControls.setName("cv controls");
cvControls.add(bInvert.set("invert", false));
cvControls.add(threshold.set("threshold", 29.0, 1.0, 255.0));
//now add the param group to the gui
gui.addGroup( cvControls );
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