Returns the (possibly null) current camera of the given VisionPortal.

This is in the org.firstinspires.ftc.vision package so it can access the protected VisionPortalImpl.camera property.

Example

Stream the vision portal's camera to FTC Dashboard.

val camera = getVisionPortalCamera(Vision.portal)!!
FtcDashboard.getInstance().startCameraStream(camera, 0.0)

Developer Note

This is only possible because the VisionPortalImpl.camera property is protected, not private. In Java, protected items are visible to classes in the same package. This function is in the org.firstinspires.ftc.vision package so that it can read and export that property.

This is technically bad practice and could break between minor updates to FtcRobotController.

This was originally written to support streaming the camera to FTC Dashboard without writing a custom vision processor that just copied the pixels over. For a real-life example, look at the AutoMain opmode.