3D effects like HTC One Dimension plus Its true that HTC one M8 uses dual camera to achieve the 3D Dimension plus effect, but can anybody tell what is it called, if its a series of image manipulation?

Demonstrated here, 
Video
The technique demonstrated in the video appears to be "image morphing" which is not specific to 3D.  They have "morphed" a left-eye view to a right-eye view and back.  The resulting animation is a form of "wiggle" stereoscopic presentation.

See http://en.wikipedia.org/wiki/Morphing

Here's an example I just made from an old stereo pair
of a Civil War cannon, from the Library of Congress.  I used
ImageMagick's "-morph" option to rock back and forth between
the two images:

http://www.simplesystems.org:/users/glennrp/stereo/loc_cannon.gif

See also the "wiggle method" of stereoscopy, with some more examples,
at http://en.wikipedia.org/wiki/Wiggle_stereoscopy
This method typically just alternates between the left and right images, but sometimes "morphing" or filling in with intermediate photos are used.