The closing of the book was the hardest part of the whole project and I am still not able to ace it. This was into two main parts, one was the 3D card node and the other was the corner pin 2D.
So the 3d card node and the card node are two different things. The card node needs to be connected scene and later to the scanline render. On the other hand, 3D cared works without any scene or the scanline render. For the book to close, I had to match the speed of the book closing and then animate the 3D card to that speed.
For the fake page to stick on the real page, I had to track the markers, then later export it as 2D corner pins and there and one more corner pin to make sure that it doesn’t move. For the other side of the page, I just gave a roto to match the closing of the book.
In the end, colour the footage and gave a defocus and I used Davinci Resolve to add some background sound.