line crossing detection

Hi all, Got a question about the smart tracking feature with in the Hikvision dark fighter I have purchased, I have setup the relevant settings for the line crossing to trigger the smart tracking and also done the configuration on the PTZ settings for the smart tracking. I have noticed that the...

I have my Hikvision Turret setup to email me on Line Crossing Detection and most times the picture of the people are blurry but the rest is sharp. DS-2CD2355FWD 5MP Ver. 5.5.0