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Are you sure that you can open the default camera? You simply return Success without a check.

First I would eliminate the videocapture handling from the native code and see if the native call works from the onCreate.

Anyway have you set the following in Android.mk?

OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on

Have you set camera rights in AndroidManifest.xml?

<uses-permission android:name="android.permission.CAMERA"/>

Do you specifically need static initialization? If so then you need to configure your environment according to this description. Otherwise it is recommended to use async initialization.