Planar Homographies in MATLAB
No can do. Your scene is not not planar, nor the camera motion you want to simulate is a pure rotation about the camera's center (a "pan-tilt"). These are the only cases where an image transformation with a pure homography will yield a realistic result.

One thing you can do is select one of the planes apparent in the image, and then
warp the whole image applying a homography to it - for example, you could make the left-side wall appear frontal. But your example has real parallax between the views, so it cannot be achieved with a homography.