Sorry, I fail to copy the link to the analyzer
OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.
obsproject.com
For recording use CQP instead of CBR.
Set the CQ level between 23 and 15 (lower better quality)
Depending on the game and how it works higher values of fps may affect OBS capture. It's safe to use 60 fps ingame and if you have a good modern computer you can go up to 120 with no issues for OBS.
Setting priority in OBS settings don't do much. Blame Microsoft. What do the trick is running OBS as admin.
And finally, Modern Warfare (2019) / Warzone (a.k.a cheatzone) isn't well optimized and use more resourcer than it needs. In this particular game it's better to be on the safe side of graphics quality. Their recommended spects are practically the basic ones.