The system error issued to the background app won't be shown to users and the OS itself will continue preventing it from accessing the camera of its hardware host. (androidheadlines.com)
You can, for example, access the camera app by double tapping the power button. (techcrunch.com)
In this new notification center, you can access your camera by swiping to the left, and the Today view by swiping to the right (just like the lock screen). (digitaltrends.com)