To catch a floating object

i want to do it more realistic

Creating the video you showed is very easy. This is a technique called "Match cut" that matches the position and outline of the subject you want to draw attention to.

1. Shoot two scenes. A: No phone, B: Phone in hand.
2. Load the phone image with the background removed.
3. Overlay the phone image on A and move it with animation. (tracking or keyframing).
4. Match the locations of A and B's phones.

What is the most difficult step for you?

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Match cut example

⚫︎Shohei Ohtani

You can do it with very precise position of the talent - you - but it if far easier if you just change the position of the camera, for example from a wide angle to a close shot. The viewer would be rather easily "fooled".

I was going to try and do a quick example, but my iPhone appears to be failing... after 8 years of loyal work, I may have to part with my trusted iPhone 7... and have a good excuse to get a new toy!

Of course the simplest and most realistic way is to do it as a magician would and not use FCP at all.

Get a friend (out of shot) to dangle a phone or other object fastened with "Magician's Thread" (which is a very fine almost invisible thread) and simply video yourself grabbing it.

Because of the phone's weight you may need more than one thread.

Magician's Thread

At a distance, cotton would probably be invisible.

Another method would be to have a confederate in a green suit holding the phone or waving it about.

Film the background first and then yourself grabbing the phone.

Place the background clip in the timeline with the grabbing clip above it and use the Green Screen keyer to key out the green suited assistant.

Green Screen Suit

I’m not sure what would be the most difficult in what you mentioned (i'm new to video editing)

Please don't worry. The people who have been giving advice in this community for many years are not familiar with FCP operations from the beginning. You'll get better at it by repeating a lot of failures and verifications.👍

As Ian said, it's a good idea to be creative when shooting. As Luis said, how to "trick your brain" is important.

Does anyone know how to create the effect where there's a floating object

I don't know if it's the effect you want, but it's just an example. This is the story of a lucky butterfly disguised as an iPhone that reaches Luis.

• Track the butterfly's movement and apply it to the iPhone image (keyframe animation is also possible).
• Create a story with continuity by editing cuts.

What object?

Have you seen a video showing the effect which we could watch?

You should. The cameras in the recent phones are unbeliveable.

No one else can see the images in your head. If you can't show it with a concrete link video or rough cut, you'll have no choice but to solve it yourself.

There's no quick way!

The theory is fairly simple involving several shots, careful positioning of the arm and superimposition of the floating phone but it's too complex to write down.