seqInsertSlice   2937 modules/core/include/opencv2/core/core_c.h CV_EXPORTS void  seqInsertSlice( CvSeq* seq, int before_index, const CvArr* from_arr );
seqInsertSlice   3030 modules/core/include/opencv2/core/core_c.h     seqInsertSlice(seq, idx, &m);