The image sensors and build quality of those cameras is INCREDIBLY cheap. For comparison, stand outside with a GoPro or any reputable camera brand. Sony is known for quality image sensors, but you'll pay for that quality.
The reason you see the glare is technical and related to dynamic range of the sensor. It's an "all or nothing" situation... the sensor does so-so when the scene is evenly lit, but throw in a bright spot (glare) and most everything gets "blown out".
Adjusting the video display is probably fruitless... you're just changing the display characteristics of an already poor image.
As suggested, try turning off the infrared, and maybe putting a small piece of flat black (matte) plastic on the side of the MH by the camera to reduce the glare from the MH wall?
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