OpenCv tracking moving objects in video three difference method draws a rectangle filtering area

ConsoleApplication1
ConsoleApplication1.sln
...................\ConsoleApplication1.vcxproj
...................\ConsoleApplication1.vcxproj.filters
...................\ConsoleApplication1.vcxproj.user
...................\Debug
...................\.....\CL.read.1.tlog
...................\.....\CL.write.1.tlog
...................\.....\ConsoleApplication1.Build.CppClean.log
...................\.....\ConsoleApplication1.lastbuildstate
...................\.....\ConsoleApplication1.log
...................\.....\link-cvtres.read.1.tlog
...................\.....\link-cvtres.write.1.tlog
...................\.....\link-rc.read.1.tlog
...................\.....\link-rc.write.1.tlog
...................\.....\link.read.1.tlog
...................\.....\link.write.1.tlog
...................\.....\tst.obj
...................\.....\vc110.idb
...................\.....\vc110.pdb
...................\lena.jpg
...................\Mayaball.avi
...................\Mayaball.flv
...................\tst.cpp
Debug
.....\ConsoleApplication1.exe
.....\ConsoleApplication1.ilk
.....\ConsoleApplication1.pdb

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