Well, a person who is good with graphics programs such as Photoshop can often remove objects and touch up photos, but it requires learning how. If there are classes on programs like that available in your area it would be a great idea to take one.
If that isn't an option, you could also likely find tutorials online (on YouTube and elsewhere) for a chosen program you decide to use.
Here is the problem with this particular photo though. The truck is a very large element in the picture and takes up the majority of the background. Because of that, it gives almost nothing to work with in order to create a new background behind you. It would be difficult if not impossible to create a convincing new background that doesn't already exist there.
As an example, a picture of a ball on a grassy yard could easily have the ball removed because the grass offers an existing background texture that someone can probably expertly copy over top of the ball in a way that isn't noticeable, making it blend in with the rest of the grass.
This photo however only has a small area of leaves to work with and would be very hard to make look convincing if the whole area of the truck is just filled in with leaves. Which, because it's a small section of leaves to work with, may also make a repeating pattern of the leaves too noticeable.
However you could use a program to cut out all the background elements and just add in a background color instead, or carefully select it and do a slight blur on all but you and the owl so you stand out more and make the background look beyond the focal point.