Accesse external USB camera using camera2 API or other

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I am trying to develop an app to capture image from an external USB camera.

When i list down the camera devices using cameraManager it only shows the internal cameras (Front and Back).

When i do,

packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_EXTERNAL)

it returns false which means external camera support is not available in my android tablet.

How can i resolve this?

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