I don't know if you used the same method to solve the problem that JAR used in his AEX. He say "he solved all problems with camera", but I tried and sometimes it worked, sometimes it stuck while recording, sometimes it stuck in 1 second and then crash. It's very unstable.Wierd. It was working for me. I will check the logcat. Try rebooting!
Only stable camera I found was in builds that use hyper sources (but there whatsapp recording don't work).
I tried AEX by jar, XPE, Atomic. All have issues with camera recording.