Q:

How do I get HDR+ working on Cyanogenmod for Nexus 5?

HDR+ does not work on Cyanogenmod for Nexus 5. The Google Camera app simply crashes when selecting HDR+. How do I get it working?

A:

PA-GApps has packaged the necessary support files, which are flashable as a zip. You can use just the Google Camera module.

HDR support files from the Nexus 5 factory image have been added to
  all GApps packages. This may help users who prefer to install Google
  Camera from the Play Store [Stock/Full/Mini/Micro]

