Hello friends,
I was checking some adverts when I came across an interesting look. Though it is common and we see them frequently, can someone kindly suggest how this is achieved? Ca the same be achieved in post ? The whole video has a strange light effect (I dont know what to call)

Pardon me if I am mistaken......but my knowledge says either of the following points through which this was achieved. Please suggest. 

Will be thankful if some examples (or links) are also attached with the answer.
 

My observations are:
1. Perhaps use of 50mm lens
2. Perhaps lens-whacking
3. Perhaps back-lighting

Regrds.

Anirban