My recommendation would be to do the following :
1.Get Vuforia working inside a Unity Project with the Magic Leap SDK.
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Once you have Vuforia working, use the Magic Leap Camera Example that is on the Magic Leap Developer portal. The example script will provide a callback when a video frame is retrieved. (If you use the OpenXR workflow enable the perception snapshots setting)
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Use the camera visualization example posted on the developer docs to visualize the frame inside your app.
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Build and run to make sure it works as expected.
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Add the Get frame pose function and log the camera position.
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Run the example to see if it works as expected.
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Integrate both Vuforia and the camera script to verify that you are able to obtain the pose.
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Finally add your additional image processing logic
Let me know if you run into any issues or have any questions.