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recently i have solved the same problem and try to explain the steps i followed.

i updated the most recent opencv_ffmpeg.dll i renamed opencv_ffmpeg.dll to opencv_ffmpeg310.dll to use with OpenCV 3.1, also renamed same dll opencv_ffmpeg2412.dll to use with OpenCV 2.4.12

by doing that, a basic capturing frames and display became successful without problem.but still the same problem if i do some image-processing or detection causes delay between capturing frames.

to solve the second problem i used a thread to grab frames continiously and update a global Mat for processing.

here you can find my test code ( it need some improvements like using mutex and lock memory when update the Mat)

i hope the information will be useful ( sorry for my poor english )