I don't know about zooming in-to Google Earth but I accidentaly discovered how to do image streams in Elab when I rendered a film and it came out in images and it was 164 frames so I had to delete all of them. But, anyway first you have your footage you want to create an image stream with, then you go to the tab at the top that sais "RENDER", then you click on it so the menu pops down, then you click on the thing that sais render options and under file type select PNG then render it and VOULA!!
Hope I helped somehow!
?oh,yeah, you should probrably make a new folder and render it to there other wise it gets to complicated on the desktop.