This is a paid asset, but now you can download Mobile Touch Camera Free.
Detail this asset from Unity Store: Original Link
Mobile Touch Camera v2.4 (Latest version)
Mobile Touch Camera v1.9
“If possible, please buy the package to support the developer”
Mobile Touch Camera is a powerful Camera & Input Handling tool that allows you to create a smooth and natural Touch-Input camera with integrated Item Picking for best usability. The asset is best suited (but not limited) to tower defense, strategy or adventure type of games for mobile devices.
* Pixel Perfect Scroll & Pinch.
* Camera Movement and Item Picking integrated for best usability.
* Demo scenes for top-down, 2d sidescroll, and isometric scenarios.
* Supports perspective and orthographic cameras.
* Custom inspectors to help you tune the asset more efficiently.
* Seamless transition between pinching and scrolling. E.g. Start dragging with 1 finger, add second finger to pinch/zoom, release finger to go back to scrolling.
* Swipe and release quickly for smooth auto-scrolling.
* Mouse Emulation for convenient development on PC.
* Camera rotation & tilt gestures.
* Full C# source code.