Create a cylinder with dimensions matching the resolution of your image, turn off caps, and apply a material to the cylinder with your panoramic image added as a texture in the material’s Color channel (disable Reflectance or the image will look washed out). Set the Material Tag’s Projection to “UVW Mapping,” and set Side to “Both” or “Back” since the camera will be on the inside of the cylinder. And since the camera will be looking at the back of the image, enable Tile, and set the Length U to -100% to reverse the image so that it looks correct.
Add a camera, zero out its position coordinates to place it in the center of the cylinder, and adjust its Field of View (Vertical) to fill the render area vertically. You can then animate the camera’s H rotation (Coordinates) to “pan” left and right as desired.