  After the recent discovery of the Higgs boson, the next important goal is to
measure its properties. Probing the Yukawa coupling of the Higgs boson to top
quarks is a particularly important test of physics beyond the standard model.
This coupling can be experimentally accessed by measuring the cross section of
the Higgs boson production in association with a top quark pair ($t\bar{t}H$).
The talk gives an overview of CMS results on $t\bar{t}H$ searches, using the
full dataset of pp-collision data collected at the centre of mass energies of 7
and 8 TeV. All relevant Higgs boson decay modes have been studied, including
Higgs decays to b-quarks, photons, $\tau$-leptons and multi-lepton final
states. Additionally, the first Matrix Element Method based analysis has been
carried out, that aims to further increase the sensitivity to the signal.
