videostab: fix CUDA build

reverts CUDA related stuff of commit ff0167b981

modules/videostab/include/opencv2/videostab/global_motion.hpp

@@ -274,8 +274,6 @@ public:
     void setOutlierRejector(Ptr<IOutlierRejector> val) { outlierRejector_ = val; }
     Ptr<IOutlierRejector> outlierRejector() const { return outlierRejector_; }
 
-    virtual void setFrameMask(InputArray mask) CV_OVERRIDE { mask_ = mask.getMat(); }
-
     virtual Mat estimate(const Mat &frame0, const Mat &frame1, bool *ok = 0) CV_OVERRIDE;
     Mat estimate(const cuda::GpuMat &frame0, const cuda::GpuMat &frame1, bool *ok = 0);
 
@@ -284,7 +282,6 @@ private:
     Ptr<cuda::CornersDetector> detector_;
     SparsePyrLkOptFlowEstimatorGpu optFlowEstimator_;
     Ptr<IOutlierRejector> outlierRejector_;
-    GpuMat mask_;
 
     cuda::GpuMat frame0_, grayFrame0_, frame1_;
     cuda::GpuMat pointsPrev_, points_;

modules/videostab/src/global_motion.cpp

@@ -815,7 +815,7 @@ Mat KeypointBasedMotionEstimatorGpu::estimate(const cuda::GpuMat &frame0, const
     }
 
     // find keypoints
-    detector_->detect(grayFrame0, pointsPrev_, mask_);
+    detector_->detect(grayFrame0, pointsPrev_);
 
     // find correspondences
     optFlowEstimator_.run(frame0, frame1, pointsPrev_, points_, status_);