I'm not going to write your

I'm not going to write your project for you, but I can say that you might look at how I set up my GPUImageHistogramGenerator to see how you might create a realtime plot using OpenGL ES and then overlay that on incoming video (as I do in the histogram example in the FilterShowcase). With some modifications, this could be made to do simple line plotting of incoming accelerometer data.

You could also look at using Core Plot to graph this, and then import that as a UI element, but your rendering performance will most likely suffer because of all of the Quartz drawing involved.

Sunset Lake Software - Comments for "Record video with data overlay information"

I'm not going to write your