Hello,

Please, check the setting according to the article :Working with the HoloLens Sample in Unity  There you can find the info how to use the example or how to setup a new scene.

But I think the best /easiest approach will be to create a new project, to load the HoloLens Assets  and  to open the scene   Assets\SampleResources\Scenes\2-ImageTargets

Please, test first if the project could be started on your device and if it works with the provided demo ImageTargers  Assets\Editor\Vuforia\ForPrint\ImageTargets

As next step you import your ImageTargets database and adapt the Image Targets and the augmentations / child of the ImageTarget elements. For additional image targets you could duplicate some of the existing ImageTargets

BR

Vuforia Engine Support

Hey, I had a similar issues initially that the Hololens didn't activate the camera.

Make sure that the camera is active on the Hololens, after you started your app. a small white led should be active next to the camera indicating its active status. My apps don't ask for camera permission and I had to manually allow them in the Application settings. 

Go to Settings->Applications->Your Application check Camer a permission on

Do you get the solution? I face the same problem and no solution come up.. :(

 I tryed to tag ARCamera as MainCamera. But my HoloLens still didn't turn on the camera.

You don't need two cameras in your scene, just add the Vuforia scripts to the HoloToolkit camera and tag it with "MainCamera".

Make sure your AR objects are on a layer, that is actually rendered by a camera.

The near clipping plane is (per default) quite far away from the camera so maybe your objects are too close to the camera to be rendered. Adjust the distance of the near clipping plane accordingly.