So I think I’ve made the best MoCap correction plugin for Blender ever. Admittedly, the bar isn’t that high - Blender is notoriously bad for layered corrections and even with plugins like Animation Layers you still need IK rigs and constraints to easily make adjustments and retain dense keyframes. So I got tired of going through the same painful process each time and made a plugin to cover my most common workflows. It has auto IK rigs, overlays for correction zones and blends, Pin and Pin follow mode for limb locks and tracking, keyframe mode for individual bone adjustments, Motion paths, quick previews, blend curve presets and more - It’s fully stacked and surprisingly fast to process. But, one of the best things is it bakes over the original keyframe set so can keep all the original nuance of the original performance. If you do any kind of mocap correction trust me, you want this plugin.
Plugin and quick start tutorial 
https://www.patreon.com/goodgood3d