Hello Mert, welcome to Using English!
1. I saw you kiss him.
2. I saw you kissing him.
#1 presents the action as a whole; #2 presents the action as if it were in progress. So both are correct; there is simply a difference in focus.
3. I can't see you marrying me.
4. I can't see you marry me.
Here, only #3 is idiomatic; "see" means "imagine", and with that meaning, "see" takes an ing-form.
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