The Android 4.0.4/Sense 4.1 update for the HTC One X brought with it some major improvements. Along with some speed and battery life improvements, HTC toned down the animations in its Rosie launcher, making things much more smoother and faster.
The update also included a newer version of the Camera app, which contains certain UI tweaks and slightly better performance. The Camera app had already leaked for the One X before the Sense 4.1 OTA update was rolled out by HTC. Now, the same Camera app has been found to work without any modifications on the HTC Sensation as well.
The Sense 4.1 Camera app will work on any rooted HTC Sensation running Android 4.0/Sense 3.6 or higher. The options to record videos in Full HD resolution and in Slow Motion don’t work as of now, which should be hopefully fixed by a developer in the future.
The download link of the app, along with the required steps to install it can be found on this thread at XDA forums.
Credits to TJD319 for finding out that the app works on the HTC Sensation as well!