OpenCVのカメラの実装時のエラー

###前提・実現したいこと
AndroidstudioにてOpenCVをつかったJavaCameraViewを動かしたいのですがエラーに悩まされています。

###発生している問題・エラーメッセージ

Runログ
I/OpenCV/StaticHelper: -----------------------------------------------------------------
I/MainActivity: Opencv loaded successfully
D/JavaCameraView: Connecting to camera
D/JavaCameraView: Initialize java camera
D/JavaCameraView: Trying to open camera with old open()
W/CameraBase: An error occurred while connecting to camera: 0
E/JavaCameraView: Camera is not available (in use or does not exist): Fail to connect to camera service
D/JavaCameraView: Trying to open camera with new open(0)
W/CameraBase: An error occurred while connecting to camera: 0
E/JavaCameraView: Camera #0failed to open: Fail to connect to camera service
D/JavaCameraView: Trying to open camera with new open(1)
W/CameraBase: An error occurred while connecting to camera: 1
E/JavaCameraView: Camera #1failed to open: Fail to connect to camera service
D/JavaCameraView: Disconnecting from camera
D/JavaCameraView: Notify thread
D/JavaCameraView: Wating for thread


実機側
it seems that you device does not support camera (or it is locked).Application will be colosed.

###該当のソースコード

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tomoe.opencvcamera">
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera2" android:required="false"/>
    <uses-feature android:name="android.hardware.camera2.autofocus" android:required="false"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceView;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.JavaCameraView;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;

public class MainActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{

    private static String TAG = "MainActivity";
    JavaCameraView javacameraview;
    Mat mRgba;
    BaseLoaderCallback mLoaderCallBack = new BaseLoaderCallback(this){

        @Override
        public void onManagerConnected(int status) {
            switch (status){
                case BaseLoaderCallback.SUCCESS:{
                    javacameraview.enableView();
                    break;
                }
                default:{
                    super.onManagerConnected(status);
                    break;
                }
            }

        }
    };

    static {
        if (OpenCVLoader.initDebug()){
            Log.i(TAG, "Opencv loaded successfully");
        }
        else {
            Log.i(TAG, "OpenCV not loaded");
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        javacameraview = (JavaCameraView)findViewById(R.id.java_camera_view);
        javacameraview.setVisibility(SurfaceView.VISIBLE);
        javacameraview.setCvCameraViewListener(this);

    }

    @Override
    protected void onPause(){
        super.onPause();
        if(javacameraview!=null)
            javacameraview.disableView();
    }

    @Override
    protected void onDestroy(){
        super.onDestroy();
        if(javacameraview!=null)
            javacameraview.disableView();
    }

    @Override
    protected  void  onResume(){
        super.onResume();
        if (OpenCVLoader.initDebug()){
            Log.i(TAG, "Opencv loaded successfully");
            mLoaderCallBack.onManagerConnected(LoaderCallbackInterface.SUCCESS);

        }
        else {
            Log.i(TAG, "OpenCV not loaded");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_11, this, mLoaderCallBack);
        }
    }

    @Override
    public void onCameraViewStarted(int width, int height) {
        mRgba = new Mat(height,width, CvType.CV_8UC4);
    }

    @Override
    public void onCameraViewStopped() {
        mRgba.release();
    }

    @Override
    public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        mRgba = inputFrame.rgba();
        return mRgba;
    }
}