Does anyone have any tutorial, link, video etc on how I can use Open Street Map for routes?
I know google maps and saw that I can easily do that. But this application will have an internal module and we can not afford the license.
[GIS] Using OSM for routes
openstreetmaprouterouting
Related Solutions
GRASS v.net.iso will give you a result like this:
You might not want to run a convex hull algorithm on this output. Imagine the blue roads: A convex hull around them would contain a lot of parts that are not reachable in the time represented by "blue".
Instead, you might want to look into alpha-shapes (related question: What are Definition, Algorithms and Practical Solutions for Concave Hull?)
You can create drive time isochrones using pgRouting and QGIS (as described here). I didn't use OSM in this case, but of course you could build your routable network based on OSM (see osm2pgrouting tool).
For a pure PostGIS solution, you can use pgRouting alpha shape function. Here is a comparison of alpha shapes as implemented in pgRouting and the approach I presented in the previous update:
Colored areas represent the results of alpha shape function, black lines are the results of the interpolation approach described earlier. The catchment areas are less detailed using pgRouting's alpha shapes. Also, there seems to be no way to vary the value of alpha to create more detailed representations.
SpatiaLite has routing support, and its probably a bit easier to understand than some of the "bigger" engines. See the docs. More searching, following links, reading the code and so on will help you to understand this, and given your stated needs, I won't provide step-by-step instructions here.
I understand that you don't want a canned solution, but I think you may benefit from looking at a simple working system.
Best Answer
GraphHopper (using OpenStreetMap Data)
Video https://www.youtube.com/watch?v=HBVe_E5j0TM