add Face tracking demo code

pansen

2018-12-18 96024c860270477fe9cf387ba855632a3ead08ee

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# Compiled Object files
*.slo
*.lo
*.o
*.obj
 
# Compiled Dynamic libraries
*.so
*.dylib
*.dll
 
# Compiled Static libraries
*.lai
*.la
*.a
*.lib
 
# Executables
*.exe
*.out
*.app