use opencv to draw circle in image

myffmpeg
........\avcodec.dll
........\avformat.dll
........\avutil.dll
........\ffmpeg_full_SDK_V3.0
........\....................\Libs
........\....................\....\Debug
........\....................\....\avcodec.dll
........\....................\....\avcodec.lib
........\....................\....\avformat.dll
........\....................\....\avformat.lib
........\....................\....\avutil.dll
........\....................\....\avutil.lib
........\....................\....\ffmpeg.exe
........\....................\include
........\....................\.......\adler32.h
........\....................\.......\allcodecs.h
........\....................\.......\avcodec.h
........\....................\.......\avformat.h
........\....................\.......\avio.h
........\....................\.......\avstring.h
........\....................\.......\avutil.h
........\....................\.......\base64.h
........\....................\.......\common.h
........\....................\.......\fifo.h
........\....................\.......\integer.h
........\....................\.......\intfloat_readwrite.h
........\....................\.......\inttypes.h
........\....................\.......\log.h
........\....................\.......\lzo.h
........\....................\.......\mathematics.h
........\....................\.......\md5.h
........\....................\.......\mem.h
........\....................\.......\opt.h
........\....................\.......\random.h
........\....................\.......\rational.h
........\....................\.......\rgb2rgb.h
........\....................\.......\rtp.h
........\....................\.......\rtsp.h
........\....................\.......\rtspcodes.h
........\....................\.......\stdint.h
........\....................\.......\swscale.h
........\fxx
........\...\01.c
........\...\tutorial01.c
........\play.cpp
........\play.dsp
........\play.dsw
........\play.ncb
........\play.opt
........\play.plg
........\play.positions
........\test.avi
........\test.h264
........\test1.avi
........\video.cpp
........\video.h
........\复件 test.avi

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