Depends on the latency of the filter, I expect you will find using iir filters instead to be more reliable and easier to maintain lipsync
You then need a HDMI capture card that plays nicely with MC and something to strip hdcp off. For the former, you would need to get a recommendation from someone who has it working I think (I don't and use mpc-be instead with MC handling audio via wdm). For the latter, plenty of options out there.