i can't install opencv

edit

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pip install opencv-python
Collecting opencv-python
  Using cached opencv-python-4.4.0.44.tar.gz (88.9 MB)
  Installing build dependencies ... error
  ERROR: Command errored out with exit status 1:
   command: 'c:\users\gama\appdata\local\programs\python\python39\python.exe' 'c:\users\gama\appdata\local\programs\python\python39\lib\site-packages\pip' install --ignore-installed --no-user --prefix 'C:\Users\gama\AppData\Local\Temp\pip-build-env-ykzi43np\overlay' --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools wheel scikit-build cmake pip 'numpy==1.11.3; python_version=='"'"'3.5'"'"'' 'numpy==1.13.3; python_version=='"'"'3.6'"'"'' 'numpy==1.14.5; python_version=='"'"'3.7'"'"'' 'numpy==1.17.3; python_version>='"'"'3.8'"'"''
       cwd: None
  Complete output (310 lines):
  Ignoring numpy: markers 'python_version == "3.5"' don't match your environment
  Ignoring numpy: markers 'python_version == "3.6"' don't match your environment
  Ignoring numpy: markers 'python_version == "3.7"' don't match your environment
  Collecting setuptools
    Using cached setuptools-50.3.2-py3-none-any.whl (785 kB)
  Collecting wheel
    Using cached wheel-0.35.1-py2.py3-none-any.whl (33 kB)
  Collecting scikit-build
    Using cached scikit_build-0.11.1-py2.py3-none-any.whl (72 kB)
  Collecting cmake
    Using cached cmake-3.18.2.post1-py3-none-win_amd64.whl (34.7 MB)
  Collecting pip
    Using cached pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
  Collecting numpy==1.17.3
    Using cached numpy-1.17.3.zip (6.4 MB)
  Collecting packaging
    Using cached packaging-20.4-py2.py3-none-any.whl (37 kB)
  Collecting distro
    Using cached distro-1.5.0-py2.py3-none-any.whl (18 kB)
  Collecting pyparsing>=2.0.2
    Using cached pyparsing-2.4.7-py2.py3-none-any.whl (67 kB)
  Collecting six
    Using cached six-1.15.0-py2.py3-none-any.whl (10 kB)
  Using legacy 'setup.py install' for numpy, since package 'wheel' is not installed.
  Installing collected packages: setuptools, wheel, pyparsing, six, packaging, distro, scikit-build, cmake, pip, numpy
      Running setup.py install for numpy: started
      Running setup.py install for numpy: finished with status 'error'
      ERROR: Command errored out with exit status 1:
       command: 'c:\users\gama\appdata\local\programs\python\python39\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\gama\\AppData\\Local\\Temp\\pip-install-e3vjvwac\\numpy\\setup.py'"'"'; __file__='"'"'C:\\Users\\gama\\AppData\\Local\\Temp\\pip-install-e3vjvwac\\numpy\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\gama\AppData\Local\Temp\pip-record-8o5scm7e\install-record.txt' --single-version-externally-managed --prefix 'C:\Users\gama\AppData\Local\Temp\pip-build-env-ykzi43np\overlay' --compile --install-headers 'C:\Users\gama\AppData\Local\Temp\pip-build-env-ykzi43np\overlay\Include\numpy'
           cwd: C:\Users\gama\AppData\Local\Temp\pip-install-e3vjvwac\numpy\
      Complete output (277 lines):
      Running from numpy source directory.

      Note: if you need reliable uninstall behavior, then install
      with pip instead of using `setup.py install`:

        - `pip install .`       (from a git repo or downloaded source
                                 release)
        - `pip install numpy`   (last NumPy release on PyPi)


      blas_opt_info:
      blas_mkl_info:
      No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
      customize MSVCCompiler
        libraries mkl_rt not found in ['c:\\users\\gama\\appdata\\local\\programs\\python\\python39\\lib', 'C:\\', 'c:\\users\\gama\\appdata\\local\\programs\\python\\python39\\libs']
        NOT AVAILABLE ...