add predict_from_video to cell_nucleus_segmentor

[watarungurunnn]

part of GSoC submission

[codecov-commenter]

Codecov Report

Merging #74 (79668b6) into master (8b90b20) will decrease coverage by 10.28%. The diff coverage is 10.60%.

@@             Coverage Diff             @@
##           master      #74       +/-   ##
===========================================
- Coverage   86.22%   75.93%   -10.29%     
===========================================
  Files          12       12               
  Lines         421      482       +61     
===========================================
+ Hits          363      366        +3     
- Misses         58      116       +58     

Impacted Files	Coverage Δ
...n/cell_nucleus_segmentor/cell_nucleus_segmentor.py	45.29% <10.60%> (-43.99%)	:arrow_down:

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