How to implement gate error mitigation in Qiskit?

One naive way is based from this paper, Cloud Quantum Computing of an Atomic Nucleus, by adding odd number of CNOTs gate to the circuit and do extrapolation. It is kinda hand wavy and you hope that it will gives you something closer to the true result.

So let's say your original circuit is:

Here you have 1 CNOT gate. Then you would perform another execution using a longer but identical circuit:

Here you have 3 CNOT gates. At this point, you use the two results to do your extrapolation.