When learning-based algorithms were not nearly as good as they are today, this problem was mainly handled by handcrafted techniques, but they had their limits - after all if we don’t see something too well, how could we tell what’s there? And this is where new learning-based methods, especially TecoGAN, come into play. This is a hard enough problem for even a still image, yet this technique is able to do it really well even for videos.
Applied Singularity 