If PTZ camera area zoom does not work, then the reason is that the camera driver does not support the area zoom feature.
Below drivers are supporting area zoom:
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NewAxisIPCapture
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EHIIPCapture
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CanonIPCapture
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DahuaIPCapture
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NewMobotixIPCapture
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NewPanasonicIPCapture
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NewSamsungIPCapture
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PelcoIPCapture
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NewSonyIPCapture
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WisenetIPCapture