A "blinking dot" is just a collection of layers, some of which have their opacity animated to give the illusion of lights going on and off. You'd build a pre-comp for that and then place it over your main footage with whatever means you need - manually, with tracking, using effects to distort them into place. A web search just based on these few snippets will turn up enough tutorials, you just need to tie the different techniques together.
Thank you so much for your useful suggestions and detailed guidance.
I have been looking for tutorials online but cannot find anything to create exactly the thing I have in mind.
Plus being relatively new in after effects makes me more handicapped in the entire approach for the execution.
Could you suggest a simple method to execute this?
I wish to execute a blinking LED dot, one that would be emitted from a device or a robot, like a blinking red shiny signal.
Looking forward to your response.
There are basically three options here depending on how much motion there is in the image:
1) Static camera, static dots
2) Static camera, moving dots
3) Moving camera
For (1), you could simply create the dots as shapes and then animate (keyframe) the opacity value to make them blink on and off.
For (2), you will need to track the motion of the marker dots and apply the tracking information to the shapes
For (3), the best option would likely be to track the 3D camera and create 3D null to attach the shapes to, but the same solution as for (2) could also work, and it is easier to learn.
Here is a tutorial that covers motion tracking here (I haven't watched it, just peeked at it, but it seems to cover the basics):