Added missed file

modules/videostab/src/frame_source.cpp

+#include "precomp.hpp"
+#include "opencv2/videostab/frame_source.hpp"
+
+using namespace std;
+
+namespace cv
+{
+namespace videostab
+{
+
+VideoFileSource::VideoFileSource(const string &path, bool volatileFrame)
+    : path_(path), volatileFrame_(volatileFrame) { reset(); }
+
+
+void VideoFileSource::reset()
+{
+    reader_.release();
+    reader_.open(path_);
+    if (!reader_.isOpened())
+        throw runtime_error("can't open file: " + path_);
+}
+
+
+Mat VideoFileSource::nextFrame()
+{
+    Mat frame;
+    reader_ >> frame;
+    return volatileFrame_ ? frame : frame.clone();
+}
+
+} // namespace videostab
+} // namespace cv