Logic User Topic slow the video down to edit then speed it back up

Hi I am try to place a effect to a piece of very short video but the object are moving way to fast for me to get the timing right
so I want to slow the video down slow enough so I can get a better rhythm of timing for line up the effect properly

How do you do this in Logic ?

The reason is because what I am doing is adding in the effect in real time while I am watching the video that why I need it to slow down

If you can’t find a way to do that in Logic, maybe you could use an online video speed converter to convert the video to half speed and import that into Logic?