Any tuts on a moving object and how to apply a video onto the green screen portion?

If you have Motion, this is one way:

https://www.youtube.com/watch?v=qZk0UqX6HP8

There might be methods you can use with Object Tracking, but I don't have any experience with that (still in 10.4.10). Hopefully somebody else will chime in...

Any tuts on a moving object and how to apply a video onto the green screen portion?

Is this example what you want to do?

Green screen template

Example of applying templates to still images and videos

Functions used:

• Green screen keyer
• Deformation
• Distortion
• Shape mask
• Keyframe animation

It's difficult to make accurate suggestions without seeing the template you want to use. This is because there is a considerable difference in movement between the right and left sides of the smartphone in the example.

The right one is relatively easy to make because the main movements are straight forward movement and rotation.

The left side is more difficult as it changes from the back side to the front side and requires reproducing three-dimensional movement.

The one on the right is for beginners, and the one on the left is for intermediate and advanced users. Both can be created using only FCP's default functions, but require the user's ability.

FCP has tracking built-in, use that.

Search YT for "Final Cut Pro Tracker" and there's tons.