These plugins are in my opinion a must have in Davinci Resolve. Besides being free, they can speed up your workflow as you don't have to spend time doing any key frames and customizing certain things.

MagicZoom by Mr Alex Tech:
   • ZOOM LIKE A PRO! Free MAGIC ZOOM tool...  

mCamRig and free Motionvfx Plugins:
https://www.motionvfx.com/store,mcamr...

Picture in Picture Pro by Patrick Stirling:
   • This FREE Plugin can make HUNDREDS of...  

00:15 - Magic Zoom
01:17 - mCamRig
02:16 - Picture in Picture Pro