any limit of putting too many videos/animations in presentations In the context of applied maths, physics and engineering. Videos/animations beat pictures and thousands of words, as is known to all. Is it bad to put too many videos/animations in a presentation? It's hard to define 'too' though.
If you have "too many", then, of course, it's "bad". This is more or less the definition of "too many". 

How many is too many, is dependent on the situation and who you give a talk to. I have seen good presentations with videos illustrating a point and also short animations/memes which made the audience laugh and gave them time to breath after a long and heavy theoretical slides. (I don't like memes, but nevertheless I enjoyed those animations).

(Keep in mind that here are many mathematicians and a typical math talk has no animation/video, so you will probably get a lot of answers/comments  similar to "I've never seen a good talk with animations in my life". It would be best if you would write your field.