use
Specifies if face detection and further tracking should be performed on input frames rotated correspondingly to real orientation of the device, while screen orientation is locked to either portrait or landscape. Since 1.6.0 face detection performed by default in portrait, landscape and reverse landscape device orientation. This option should be used only to enable face detection for the reverse portrait orientation. False by default.
NOTE: Enabling this option may increase resource usage and degrade processing performance so it should be used cautiously.