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To do so would be really difficult.
There are many ways to simulate the distortion of a windswept flag in AE - try Wave Warp or Turbulent Displacement. But matching the artificial distortion to the existing flag footage would be almost impossible.
It would be easier to start with a flat flag and use AE to generate the "flapping" effect on the flag AND text. That way, the distortion of both objects would match up.
More on AE distortion effects in the AE documentation:
Andrew is right, going fully synthetic is way easier in this case, especially for a beginner. It's possible to pin stuff to very heavily warped shapes, but it almost always involves a lot of drawing mask and retouching using paint tools plus it would require some extra tools/ plugins, all of which are not included in AE, like e.g. a proper bi-directional Displacement effect or pixel-motion based warping tools. So if you're not producing this for a Hollywood movie and have the pressure on, try to find a simpler way that fits your budget and skills.
Check out Zaxwerk's 3D Flag.