Algorithms to convert 2D videos to 3D ones
Sure, there are many algorithms for this:


Some works, which directly work on H264 domain, such as:



  Real-Time 2D to 3D Conversion from H.264
  Video Compression, Nir Shabat, Gil Shabat and Amir Averbuch
  http://www.cs.tau.ac.il/~amir1/PS/3d.pdf 



Some deep learning methods already exist on the topic: 
http://homes.cs.washington.edu/~jxie/pdf/deep3d.pdf
(this is the review version of the paper, so I could not cite)
There are many other works which use images in many ways to create 3D:


http://live.ece.utexas.edu/publications/2011/cao_mag_2011.pdf

https://people.mpi-inf.mpg.de/~pdidyk/papers/2D-to-3D/2D-to-3D.pdf