There's a few things on nukepedia - attached is one I adapted from there.
Has the maths for rotation in it - select an object and run it - you'll get a 
camera rotating to the object.

Might point you in the right direction. cant remeber the difference between the 
2 off the top of my head but I use cameraTarget.py


 
Howard



>________________________________
> From: Lars Cawley <[email protected]>
>To: Nuke Python discussion <[email protected]> 
>Sent: Sunday, 27 November 2011, 9:45
>Subject: Re: [Nuke-python] Parenting a projection camera to a moving object
> 
>So, no comments on how to stick a camera to an animated axis (or object) and 
>have it maintain its relationship with it?
>
>Lars
>
>On 22/11/2011 10:22 p.m., Lars Cawley wrote:
>> Having thrashed around for a while trying to get a camera linked to a moving 
>> object, I'd be really happy to be shown The Way.
>> The idea is to get a camera (which is projecting an image, often some edited 
>> version of the plate) to keep it's position relative to the tracked object.  
>> This is a natural behaviour in 3D software such as Maya/Max, but not in Nuke 
>> it seems.  In Nuke the linked object inherits all transforms of the object 
>> from [0,0,0] and I scripted my way beyond that, but the rotations are where 
>> my attempts have fallen down.  I will plunge in and learn more about matrix 
>> transforms if I must, but if there is another way I would be so grateful.
>> 
>> Lars
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>> 
>> 
>
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Attachment: TargetCamera.py
Description: Binary data

Attachment: cameraTarget.py
Description: Binary data

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