Not able to access my Camera in Ubuntu

[Nivasb1]

Got this error,While accesing camera:
ni@ni-HP-Pavilion-15-Notebook-PC:~/CV$ python p1.py
lsof: status error on /dev/video*: No such file or directory
lsof 4.86
latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-f[gG]] [+|-e s]
[-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s]
[+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]
Use the ``-h'' option to get more help information.
[0]
WARNING: caught exception: SystemError("Cannot identify '/dev/video0': 2, No such file or directory",)
WARNING: SimpleCV can't seem to find a camera on your system, or the drivers do not work with SimpleCV.
ERROR:
Traceback (most recent call last):
File "p1.py", line 5, in
img=cam.getImage()
File "/usr/local/lib/python2.7/dist-packages/SimpleCV-1.3-py2.7.egg/SimpleCV/Camera.py", line 618, in getImage
cv.GrabFrame(self.capture)
TypeError: Expected CvCapture for argument 'capture'