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What you are missing in your code is the loading of the ffmpeg dll. Just put the opencv_ffmpeg300_64.dll from the OpenCV installation into the java library folder, i. e. where the opencv_java300.dll resides and add this to your code:
System.loadLibrary("opencv_ffmpeg300_64");
Just tried it, works fine.
ps: Where did you get these videos, are they free to use? I just started with OpenCV and java yesterday and would need some samples.