Easy to use Inference code

[Bilal143260]

This pull requests contains easy to use inference code. The shell script provided by authors for inferecing doesn't save video files. Also for generating videos on custom images one has to rewrite the .yaml file.

The script can be run by using

python script_name.py path_to_reference_image.jpg path_to_motion_sequence.mp4 --seed 123 --steps 50 --guidance_scale 5.0

[PladsElsker]

#71