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yes, true, it's too early after OpenCVLoader.initAsync

private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
                mOpenCvCameraView.enableView();
                // earliest possible place
                // to put opencv code
                break;
            default:
                super.onManagerConnected(status);
                break;
        }
    }
};

public void onCameraViewStarted(int width, int height) {
    // another safe place for opencv code
}