If you made a backup of (or can find another's backup of) the Stock rom for your phone, you should be able to extract the Camera.apk (sometimes called LegacyCamera.apk, depends on your Android versions/Device it seems) and install that on your phone, just as you would any other apk off of an sd card.
Phone: BLU Studio 5.0S D570a
| Pseudo-Stock 4.1.2 | Net10 (operating on AT&T)
Acer Aspire 5733, Intel Core i3-380M @2.53GHz, 8GB DDR3 RAM @1333MHz | Ubuntu 14.10
Dell Optiplex GX270, Intel Pentium 4 Single Core @3GHz, 2GB DDR2 RAM @667MHz | Ubuntu 14.10 | Dreams to replace with an Arduino & external HDD.
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