Objects
MOPs Camera Blender takes one or more input cameras and blends both the transforms (position, orientation, scale) and the attributes (focal length, aperture, focus distance) smoothly along an automatically generated path.
If the generated path isn't exactly to your liking, you can use the "Export Path to SOP" button to merge the generated path into a new SOP network, where you can resample and tweak it however you like. You can even use MOPs nodes to alter the path to your liking... MOPs Aim, MOPs Transform, and any other node that impacts position or orientation can be used to adjust the output camera. Just remember that the aim axis for cameras is -Z, not +Z!
You can also add procedurally-generated camera shake, or even a physical spring-like force to the camera as it moves. By default, camera shake is position-based, so the camera won't shake if it isn't moving. If you want more control, set the noise to be Time-Varying under the Noise Properties tab, and then you can keyframe the intensity however you like.
If you're using a third-party render engine with special camera attributes you need to blend, you can add those by name (glob matching is supported) via the Extra Camera Parameters parameter. Note that if you import a ton of parameters, the blending operation might slow down a bit.