a function that rotates a video

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C++/CLI

Hello to everybody!

I have to write a function that rotates a video, captured by a telecamera.
In SDK Windows I found a capture sample: playcap.

Now I think to have 2 ways:
1. Or I look for a sample that rotates a video/image.
2. Or I write my filter, but I no idea how to do it and which it is its position in the filters sequence.

I'm not sure if I consider this video as an image.
And however how to link playcap with the rotation function?

I'm working in visual c++, visual studio 2010, on win7.

Is there anybody who can help me, please?
Thanks in advance.