Metahuman LOD +Hair flickering

as for the installation of video in the sequencer, and the violation of lighting, there are insidious functions)).
Look in Show - Post Processing - turn off Eye Adaptation.

Next, in the camera settings in Post Process - Lens - Exposure - cancel Auto Exposure and turn on
Manual.
Play with numbers in Exposure under Manual, there should be 1.0 by default, but try higher, maybe up to 9.0.
Here, too, dancing with a tambourine… you need to try everything).