The trick is actually pretty simple. As I spin my hand over the object I freeze all movement. Celina then comes into the scene and replaces the object in my hand while I try to hold perfectly still. After Celina has left the frame again I continue to move as if nothing had happened.
The last step is to create a smooth transition between the remote and the soccer ball to really sell the morph effect! That is what I will teach you in this tutorial.
First off, import the clip you filmed into After Effects. Create two separate layers, one going up to the moment where your helper is replacing the object and the second one starting after the object has been replaced. I cut out the middle section where Celina pops up and replaces the remote with a soccer ball. Try to align these two clips as best as you can for a seamless transition.
There will be an obvious cut where the remote control suddenly turns into the soccer ball. Also, since I did not manage to hold perfectly still, the position of my hands and arms does change slightly from one clip to the next. We will clean up this transition as part if this tutorial.
The first thing to do however, is to morph the remote control in my hand into the soccer ball. For this, duplicate the Remote layer, rename this copy to 'Remote Morph', and trim it down to the duration of the morph effect. Make sure this layer ends exactly when the soccer ball layer becomes visible.
You should end up with a number of keyframes on the Mask Path property and the mask should follow the shape of the remote as precisely as possible. Finally, and this is important, rename the mask to 'Remote' so we can easily identify it.
Now repeat the same process for the Soccer Ball layer. First, duplicate the layer and rename the copy to 'Soccer Ball Morph'. Trim the layer down to start at the same time as the Remote Morph layer and end when the full Soccer ball layer kicks in.
As before, add a mask to the soccer ball in the Soccer Ball Morph layer.
Again, animate the Mask Path property to have the mask follow the shape of the ball as precisely as possible for the duration of the morph effect. Change the name of this mask to 'Soccer Ball'.
Select the 'Soccer Ball' mask and copy and paste it onto the Remote Morph layer. Set the mask mode to 'None' so this mask has no effect on the contents of the footage.
Now select the 'Remote' mask on the Remote Morph layer and copy and paste it onto the Soccer Ball Morph layer. Set the mask mode to 'None' so the mask has no effect on the contents of this layer.
Because each layer contains both masks and because we will use it to control the morph effect, the naming of these masks is very important! Now that we've got the basics set up for the morph effect we will use the Reshape effect to transform the remote control into the soccer ball!