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I have a Lenovo Ideatab A1000L & it has a screen-side camera. I want to plug in & use an external webcam (I’m using an old IBM UltraPort webcam from a laptop + an adapter) to minimize my having to angle myself to get a proper picture or video. Is there a driver available?

You may have better luck by looking for USB Webcam apps in the Google Play Store to see which one works with your camera. Otherwise, you will need to write code for the tablet to power the camera, and recognize the video feed.