I am told the camera can be added after, but is very expensive to do that. Something like $2K. I wouldn't bother.
2012 135i E82 MSport 6MT Jet Black
Previous BMWs - 2012 135i MSport LMB DCT(sold), 2011 X3 35i MSport VR (sold), 2009 M3 Sedan AW (sold), 2008 535xi MSport AW (sold), 2007 328xiT Barbera (sold), plus 11 others in the 70s & 80s.