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From the Matlab tutorial, you should be able to reproduce the different steps with:

• Step 1: Read Image: cv::imread
• Step 2: Resize and Rotate the Image: cv::resize, cv::getRotationMatrix2D, cv::warpAffine, also this tutorial on Affine Transformations
• Step 3: Find Matching Features Between Images: you can read the different tutorials on 2D Features framework
• Step 4: Estimate Transformation: cv::getAffineTransform, as there is no RANSAC version of getAffineTransform, you could implement yourself the RANSAC framework and call getAffineTransform on a subset of points
• Step 5: Solve for Scale and Angle: follow the Matlab instructions and/or look at: extracting rotation, scale values from 2d transformation matrix
• Step 6: Recover the Original Image: cv::warpAffine

Also a recall on the different Geometric Transformations.