Multi-effect function is a work in progress. Rumor has it that this may eventually become a copy/paste operation.
Now, with multi-selections, the Replace/Append buttons sometimes refuse to appear. If Nat's instructions fail for you, try this...
Create your Zoom for a single clip.
Right-click the clip and COPY
Now select all the clips that should receive the same effect.
Right-click on one of them and PASTE SPECIAL (effects only).
Update to the latest release. For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.