diff --git a/components/rgbd-sources/src/stereovideo.cpp b/components/rgbd-sources/src/stereovideo.cpp
index 721085330749938289367b82436bb4bcd86c969a..b162eb90b8ec92c0082eacf471fb02091d1cce0f 100644
--- a/components/rgbd-sources/src/stereovideo.cpp
+++ b/components/rgbd-sources/src/stereovideo.cpp
@@ -61,6 +61,8 @@ void StereoVideoSource::init(const string &file)
 	frames_ = std::vector<StereoVideoSource::Frame>(2); // triple-buffering for optical flow
 
 #ifdef HAVE_OPTFLOW
+	// TODO make optional, can be calculated at later step
+	
 	nvof_ = cv::cuda::NvidiaOpticalFlow_1_0::create(size.width, size.height,
 													cv::cuda::NvidiaOpticalFlow_1_0::NV_OF_PERF_LEVEL_SLOW,
 													true, false, false, 0);