A search for the standard model Higgs boson produced in association with a top-quark pair ($t\bar{t}$H) is presented, using data samples corresponding to integrated luminosities of up to 5.1 fb$^{-1}$ and 19.7 fb$^{-1}$ collected in pp collisions at center-of-mass energies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H $\to$ hadrons, H $\to$ photons, and H $\to$ leptons. The results are characterized by an observed $t\bar{t}$H signal strength relative to the standard model cross section, $\mu$ =$\sigma/\sigma_{\mathrm{SM}}$, under the assumption that the Higgs boson decays as expected in the standard model. The best fit value is $\mu$ =2.8 $\pm$ 1.0 for a Higgs boson mass of 125.6 GeV.

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