i am trying to use vcam or make one but doesnt work properly in flash mx can somebody help?

It most probably has something to do with the programing language. I'm not familiar with what environment Flash MX has, but if you downloaded both recently, the most possible scenario is that your VCam is in ActionSript 2 or 3, and I'd dare say these are not supported by Flash MX.
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some vcam work but not properly mine is as2 and it zooms out what is in the box doesnt show, its diffrenet :(

The real question here is why are you even using Flash MX

becuz others are laggy like 8 and mx is simple and basic so yeah

in what way is flash 8 laggy?

Flash 8 can lag to the point where you can't really use it that well, but you have to have a lot of plug ins, so ya, unless you have like 10 different plug ins, your computer is crap