Use opencv headless in conda

Author: Pau Gargallo

conda.yml

@@ -4,7 +4,6 @@ dependencies:
     - cmake=3.31
     - make
     - libxcrypt
-    - opencv
     - ceres-solver=2.1
     - conda-forge::llvm-openmp
     - conda-forge::cxx-compiler
@@ -18,6 +17,7 @@ dependencies:
         - matplotlib==3.5.1
         - networkx==3.4.2
         - numpy==1.21.5
+        - opencv-python-headless
         - Pillow==9.0.1
         - pyproj>=3.3.0
         - pytest==8.4.0