To install the new gallery and camera, all you have to do is follow the next steps:
- Go to Settings > Security and activate the checkbox "Unkonw Sources"
- Download the APK file
- With a file explorer (IE: ES Explorer or Astro), find the file on your SD and just pick the file and install the new Gallery (New camera included with the gallery)
- Enjoy the Google Experience camera and gallery on your HTC One or in almost any device
If you have a Nexus or stock Android Experience device, this app will replace the current camera and gallery. If you have a Sense or other kind of Android, you will notice 2 new apps in the app drawer called: Camera and Gallery which belong to the new gallery and camera (no sh*t Sherlock ).
So far this has been tested on an HTC One, an Oppo Find 5 and in an Xperia Z and it's working in all of them with no issues so it will probably work in the rest of Android devices. Also, Photosphere and Panoramic options seems to be working to in all the Android devices with no need of ROOT or anything so, go ahead and try this new camera and gallery.
Source: El Androide Libre
PS: I've tried the APK myself and it's working like a charm. I can take photopsheres and no issues so far.
Download APK here (Google Docs)
Download APK here (Dropbox)
The app requires that your phone has a gyro sensor (different from accelerometer sensor). Ensure you have this first before installing this app. You can check the "sensors" section of your phone on GSMArena if you don't know if your device has it.