I have got an apk which will work with Android 4.3
To make this apk work, please do as mentioned below.
Link : - http://bit.ly/QyLeQz
Once you have installed this apk.
Please go to settings and then to Apps tab
find Google Play Services
then Uninstall the updates and disable it.
Now you will be able to use Google Camera in Android 4.3. tried and tested...it works.