Lots of vendors on ebay and such sell them so I assume its possible. i expect that the adhesive is pretty strong so it might be a pretty long and delicate procedure with tweezers and a solvent and lots of patience. you may also have to pull bits glass out of the camera module to get optical image stabilization to work correctly. in addition one has to be very careful to keep everything very clean to avoid image quality issues.
This is likely a pretty difficult repair and despite the massive savings I would only recommend this to experienced people. otherwise you might just want to get a new phone and sell yours on ebay or something.