I want to practise tennis shots and see how I am doing. I want to use the MBA camera in my laptop or iPhone for this. How can I do it? Some apps for this purpose?
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The MBA build in cameras wont do high rate frames per second needed for your purpose.
They are a web camera type and the CCD/CMOS chip is not of a kind that can do that, regardless of the software.
iSight is a webcam, with video capture at 30 frames per second in 24-bit color.
On the iPhone there is a chance since it has an improved camera:
The iPhone 5s has a 120-frames-per-second slow-motion video mode and precision autofocus matrix metering.
Sport events would use 300 FPS on a professional level with high resolution.
If you want to measure how fast you're serving you might want to get Tennis Camera. The app measures your serve speed in real time and reconstructs the 3D trajectory of your shot. An iPhone 5 or newer is required.
Disclaimer: I'm one of the devs behind the app.