Why the author of the you tube clip did not provide a link to the original picture? Well, here it is:
_http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/00042/opgs/edr/ncam/NLA_401232890EDR_F0041632NCAM00427M_.JPG
the same from other perspectives:
_http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/00045/opgs/edr/ncam/NLA_401505163EDR_F0042100NCAM00518M_.JPG
_http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/00052/opgs/edr/ncam/NLA_402116958EDR_F0043200NCAM00440M_.JPG
_http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/00045/opgs/edr/ncam/NRA_401504049EDR_F0042100NCAM00433M_.JPG
If you turn the grey scale into negative an zoom in a little bit, it looks like a larger rock formation and the similarities to a pyramid disappear. Of course, without a better resolution, it remains useless speculation.
Edit: removed a double link.