Fix Vuforia Webcam Not Working

What is the essential answer to my question?

A Vuforia webcam usually stops working for one of four reasons: another application is holding exclusive use of the camera, the browser or operating system has blocked camera permission for the Vuforia application, the application is trying to use a different video input than the one you expect, or the camera hardware itself is not available to the system. Start by closing other camera apps, then verify permission and input selection inside the application you are using.

Which check will narrow down the cause of this symptom?

Work through these checks in order. Each check tests a different layer, so a pass or fail only tells you about that layer.

• Close competing apps: quit video conferencing tools, camera preview software, and any other program that might be using the webcam. If the camera appears after this, the cause was exclusive access by another application.
• Check system detection: open the built-in camera application on your device. If the system camera app shows video, the hardware and driver are functioning at the operating system level. If it does not, the problem is below the Vuforia application.
• Check browser or app permission: in the host application that loads Vuforia, confirm that camera permission is set to allow, not block or ask every time. A blocked permission prevents video from reaching Vuforia even when the system camera works.
• Check input selection: inside the Vuforia-based experience, look for a camera or device selection control. If the wrong camera is selected, switch to the physical webcam you want to use.
• Test in a different environment: if the issue occurs only in one browser or app, try another supported browser or a minimal test page. This separates application-specific behavior from device-level failure.

A failed system camera test does not prove the webcam is broken. It could mean the camera is disabled in device settings or that the driver is unavailable. Conversely, a working system camera does not prove the Vuforia application has permission; that is controlled separately by the browser or app.

What should I change, and how will I know it worked?

Make changes only for the layer that failed. After each change, reload the Vuforia experience and retest the original symptom.

• If another app was using the camera: keep that app closed while using Vuforia. The camera should appear when you reload the experience.
• If the system camera app was blank: re-enable the camera in operating system privacy or device settings, or reseat a removable webcam cable. Reopen the system camera app to confirm video returns before testing Vuforia again.
• If permission was blocked: change the application or site permission to allow camera access, then reload. You should see a permission prompt or immediate video.
• If the wrong input was selected: choose the correct camera in the application. Video should switch to that device immediately or after a reload.

If none of these changes restores video, the issue may require checking the camera driver or firmware for your specific operating system and hardware version. Before updating a driver or resetting any hardware, confirm the exact device model and consult the manufacturer's official guidance, because a driver update can briefly disable the camera and a hardware reset may require reconfiguration. Stop here if the system camera app also fails after enabling the camera and reseating the connection; the next step is to test the webcam on another computer or contact the hardware vendor.