cameraStartPreview(resolutionLevel=0,jpegQuality=20,filepath=None) Start Preview Mode. Throws \'preview\' events. resolutionLevel (Integer) increasing this number provides higher resolution (default=0) jpegQuality (Integer) a number from 0-100 (default=20) filepath (String) Path to store jpeg files. (optional) Need Camera Permission returns: (boolean) True if successful