CAMERA_NO_PERMISSION
CAMERA_NO_PERMISSION: number
CAMERA_NOT_AVAILABLE
CAMERA_NOT_AVAILABLE: number
CANCEL
CANCEL: number
CONTEXT_IS_NULL
CONTEXT_IS_NULL: number
IN_PROGRESS_ALREADY
IN_PROGRESS_ALREADY: number
NOT_INITIALIZED
NOT_INITIALIZED: number
SESSION_START_FAILED
SESSION_START_FAILED: number
TIMEOUT
TIMEOUT: number