After upgrading Lumia 1020 from WP 8 to WP 8.1 my camera dies. Switching back to WP 8, camera works again. AM I the only one with this problem? Nokia does not seem to be aware or care about this issue/bug.
Are you on DP or Cyan? Have you tried soft or hard resets? If that happened on DP, it would be best if you stick to WP8.0 for a little while longer. Or you can try your luck again.