I am using Canon 70d and there is a small camera symbol in my viewfinder. I dont know what that is or what it's showing. When I click the AF button, it's started blinking.
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This is the electronic level indicator. It indicates that you're not holding the camera parallel to the ground but instead have tilted it. The specific configuration indicates that you've got a tilt of greater than 2°.
From page 66 of the manual:
Note that this is configurable — you can turn it off if you don't like it. It's also available on the rear LCD during Live View shooting (where it's maybe a little more obvious as a level).
Also note the manual's warning of a 1° margin of error (or even greater when the camera is far from level).
Its a symbol representing the output of the electronic level. In this instance, the camera is tilted to the left.
See page 66 of the manual