A literal answer to the question is, report the suspicion to the prosecutor's office, and especially explain why you believe that there was perjury. That addresses the matter of "how to charge with perjury" – like all crimes, the state makes a decision.
There is a secondary issue in that the question presupposes that the officer perjured himself. That is not an observable fact, that is a legal conclusion that has to be based on some set of observable facts. We can presume that the officer testified that A happened. No (presently known) fact suggests that A did not happen. In order for the testimony to be perjury, it must first be false (not yet established). Second, it must be established that the officer knew that the statement was false, again, there is no evidence of that.
A tertiary issue is whether there was reversible error in failing to provide the dashcam video (prejudice against the defendant). That is a sufficiently separate issue that it ought to be addressed as a different question, and the answer to that doesn't impinge on the perjury question. (Even if the failure to provide the video is not sufficient to reverse the conviction, it is certainly relevant to a fresh charge of perjury by the officer).
The fact that the defendant and officer have conflicting testimonies is not enough evidence to show that the officer's statement is untrue (leaving out the knowledge-of-untruth issue). If there is an objective fact about the content of the video, that could at least show whether the statement is clearly, or possibly, false.