The Bilateral Filter example resides in the L2/examples/bilateralfilter directory.
This benchmark tests the performance of the bilateralfilter function. To preserve the edges while smoothing, a bilateral filter can be used. In an analogous way as the Gaussian filter, the bilateral filter also considers the neighboring pixels with weights assigned to each of them.
The tutorial provides a step-by-step guide that covers commands for building and running a kernel.