instalar o open cv

opencv python

# instalar o python
# instalar o pip
  -linux python2 => sudo apt install python-pip
  -linux python3 => sudo apt install python3-pip
# atualizar o pip
 - pip install --upgrade pip

- py [version] -m pip install opencv-python
- pip install opencv-python

Required build dependencies
We need CMake to configure the installation, GCC for compilation, Python-devel and Numpy for building Python bindings etc.

sudo apt-get install cmake
sudo apt-get install python-devel numpy
sudo apt-get install gcc gcc-c++
Next we need GTK support for GUI features, Camera support (v4l), Media Support (ffmpeg, gstreamer) etc.

sudo apt-get install gtk2-devel
sudo apt-get install ffmpeg-devel
sudo apt-get install gstreamer-plugins-base-devel