The Book addresses the use of Graphic Processor Units (GPUs) to optimize an existing classification algorithm based on Support Vector Machines, through parallelization with the NVIDIA CUDA framework. This algorithm is used for automatic topographic segmentation of gastrointestinal tract videos, obtained through capsule endoscopy used in real Hospital environments. After optimization of the sequential version of the algorithm, two approaches were compared: 1) the simple use of CUDA libraries, and 2) the development of full code, both Host and device. Both approaches granted substantial speedups up to ~7 times with a single GPU, and up to ~27 times with a cluster of four GPUs. With the biggest video, the classification time went down from 1h25min to less than two minutes, suggesting not only that this was a successful integration, but also that GPUs are very well suited for (and even be the answer to) several current issues that Medicine stumbles upon.