Tracking and Vertexing Capabilities of the CMS Tracking Detector with the First LHC Data

The CMS experiment relies on an all-Silicon based tracking detector for the reconstruction of charged particles in the hostile radiation environment of proton-proton collisions at the CERN LHC collider. In this article are outlined measurements of the tracking, vertexing and b-jet identification performance recently estimated from data measured by CMS at the center of mass energy of 7~TeV. The excellent tracking performance rely, in particular, on the great pixel detector tracking capabilities, which are exploited in many contexts such as seeding, b-jet identification, beam-spot monitor, etc\dots The pixel stand-alone tracking and vertexing capabilities are here shown for a particular application: the beam-spot monitor.