Gazebo file plugin - URDF connection

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Hi

I am trying to make my urdf code cleaner, in this way I have seen some ROS users that use xacro and also put the plugins structure outside the URDF model. Well in this case my robot is not so big, so I will not create a xacro...however I would like to create a .gazebo file to put my plugins (because I am using several cameras and a diff-drive plugin). However I am using an example of a guy which used xacro to model his robot...So my link .gazebo file and .urdf file is not being linked, and the plugins are not appearing in my simulation....I did not found any tutorial that explains me how to connect the .gazebo file with urdf. Can someone help me? My .gazebo file is below:

<?xml version="1.0"?>
<robot xmlns:xacro="http://www.ros.org/wiki/xacro">


<!-- camera -->
  <gazebo reference="camera_link">
  <sensor name="camera" type="depth">
    <update_rate>20</update_rate>
    <camera>


      <horizontal_fov>1.047198</horizontal_fov>
      <image>
    <width>3000</width>
    <height>2800</height>
    <format>R8G8B8</format>
      </image>
      <clip>
    <near>0.05</near>
    <far>8</far>
      </clip>
    </camera>
    <plugin name="camera_link_controller" filename="libgazebo_ros_openni_kinect.so">
      <baseline>0.2</baseline>
      <alwaysOn>true</alwaysOn>
      <updateRate>1.0</updateRate>
      <cameraName>camera</cameraName>
      <imageTopicName>/camera/rgb/image_raw</imageTopicName>
      <cameraInfoTopicName>/camera/rgb/camera_info</cameraInfoTopicName>
      <depthImageTopicName>/camera/depth/image_raw</depthImageTopicName>
      <depthImageCameraInfoTopicName>/camera/depth/camera_info</depthImageCameraInfoTopicName>
      <pointCloudTopicName>/camera/depth/points</pointCloudTopicName>
      <frameName>camera_rgb_optical_frame</frameName>
      <pointCloudCutoff>0.5</pointCloudCutoff>
      <pointCloudCutoffMax>3.0</pointCloudCutoffMax>
      <distortionK1>0.00000001</distortionK1>
      <distortionK2>0.00000001</distortionK2>
      <distortionK3>0.00000001</distortionK3>
      <distortionT1>0.00000001</distortionT1>
      <distortionT2>0.00000001</distortionT2>
      <CxPrime>0</CxPrime>
      <Cx>0</Cx>
      <Cy>0</Cy>
      <focalLength>0</focalLength>
      <hackBaseline>0</hackBaseline>
    </plugin>
  </sensor>
</gazebo>


    <!-- camera 2-->
  <gazebo reference="camera2_link">
  <sensor name="camera2" type="depth">
    <update_rate>20</update_rate>
    <camera>



      <horizontal_fov>1.447198</horizontal_fov>
      <image>
    <width>640</width>
    <height>480</height>
    <format>R8G8B8</format>
      </image>
      <clip>
    <near>0.05</near>
    <far>3</far>
      </clip>
    </camera>
    <plugin name="camera2_link_controller" filename="libgazebo_ros_openni_kinect.so">
      <baseline>0.2</baseline>
      <alwaysOn>true</alwaysOn>
      <updateRate>1.0</updateRate>
      <cameraName>camera2</cameraName>
      <imageTopicName>/camera2/rgb/image_raw</imageTopicName>
      <cameraInfoTopicName>/camera2/rgb/camera_info</cameraInfoTopicName>
      <depthImageTopicName>/camera2/depth/image_raw</depthImageTopicName>
      <depthImageCameraInfoTopicName>/camera2/depth/camera_info</depthImageCameraInfoTopicName>
      <pointCloudTopicName>/camera2/depth/points</pointCloudTopicName>
      <frameName>camera2_rgb_optical_frame</frameName>
      <pointCloudCutoff>0.5</pointCloudCutoff>
      <pointCloudCutoffMax>3.0</pointCloudCutoffMax>
      <distortionK1>0.00000001</distortionK1>
      <distortionK2>0.00000001</distortionK2>
      <distortionK3>0.00000001</distortionK3>
      <distortionT1>0.00000001</distortionT1>
      <distortionT2>0.00000001</distortionT2>
      <CxPrime>0</CxPrime>
      <Cx>0</Cx>
      <Cy>0</Cy>
      <focalLength>0</focalLength>
      <hackBaseline>0</hackBaseline>
    </plugin>
  </sensor>
</gazebo>

  <!-- camera 3 -->
  <gazebo reference="camera3_link">
  <sensor name="camera3" type="depth">
    <update_rate>20</update_rate>
    <camera>


      <horizontal_fov>1.047198</horizontal_fov>
      <image>
    <width>640</width>
    <height>480</height>
    <format>R8G8B8</format>
      </image>
      <clip>
    <near>0.05</near>
    <far>3</far>
      </clip>
    </camera>
    <plugin name="camera3_link_controller" filename="libgazebo_ros_openni_kinect.so">
      <baseline>0.2</baseline>
      <alwaysOn>true</alwaysOn>
      <updateRate>1.0</updateRate>
      <cameraName>camera3</cameraName>
      <imageTopicName>/camera3/rgb/image_raw</imageTopicName>
      <cameraInfoTopicName>/camera3/rgb/camera_info</cameraInfoTopicName>
      <depthImageTopicName>/camera3/depth/image_raw</depthImageTopicName>
      <depthImageCameraInfoTopicName>/camera3/depth/camera_info</depthImageCameraInfoTopicName>
      <pointCloudTopicName>/camera3/depth/points</pointCloudTopicName>
      <frameName>camera3_rgb_optical_frame</frameName>
      <pointCloudCutoff>0.5</pointCloudCutoff>
      <pointCloudCutoffMax>3.0</pointCloudCutoffMax>
      <distortionK1>0.00000001</distortionK1>
      <distortionK2>0.00000001</distortionK2>
      <distortionK3>0.00000001</distortionK3>
      <distortionT1>0.00000001</distortionT1>
      <distortionT2>0.00000001</distortionT2>
      <CxPrime>0</CxPrime>
      <Cx>0</Cx>
      <Cy>0</Cy>
      <focalLength>0< ...