Before tracking the image sequences, we always denoise the original plates, sometimes people use median node as well. Grade node is another helpful tool to increase the contrast. However, denoise and median nodes usually cause crash, so remember to export the sequences and reload it again as the new denoised image sequences to carry on the project in Nuke.

Here is an example that I did for 2D tracking:

I used the denoised image sequences to complete the tracking process, and then apply it to the original image sequences.