Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Top Down Camera Free.
Top Down Camera v1.0
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Top Down Camera will allow you to do the follow with your camera:
• Smoothly follow a target without jiggers
• Orbit the target via mouse drag with a custom orbiting speed
• Camera panning mode with custom panning speed
• Zoom in/out with custom min/max and custom zoom speed
• Professional looking screen shake effect with custom intensity
Check out the video/demo below!